diff --git a/src/PostIt/PostIt/ViewModels/MainPageViewModel.cs b/src/PostIt/PostIt/ViewModels/MainPageViewModel.cs
index d907606f..d1d16306 100644
--- a/src/PostIt/PostIt/ViewModels/MainPageViewModel.cs
+++ b/src/PostIt/PostIt/ViewModels/MainPageViewModel.cs
@@ -35,6 +35,18 @@ public partial class MainPageViewModel : ViewModelBase
     [ObservableProperty]
     public partial string DraftArticle { get; set; }
 
+    /// <summary>Editor buffer for the post's publication state.
+    /// Reflects the server-side <c>IsPublished</c> flag (the
+    /// existence of a row in <c>BlogSpotPublication</c>) and
+    /// is pushed to the server via
+    /// <see cref="BlogApiClient.SetPublishAsync"/> on explicit
+    /// toggle — it is NOT included in the regular Save
+    /// payload, mirroring the wire contract where
+    /// <c>BlogPostDto</c> doesn't carry <c>Publish</c> as a
+    /// mutable field. Toggling is its own action.</summary>
+    [ObservableProperty]
+    public partial bool DraftIsPublished { get; set; }
+
     [ObservableProperty]
     public partial ViewModelBase? CurrentViewModel { get; set; }
 
@@ -102,6 +114,7 @@ public partial class MainPageViewModel : ViewModelBase
         WindowTitle = "PostIt";
         DraftTitle = string.Empty;
         DraftArticle = string.Empty;
+        DraftIsPublished = false;
         CurrentViewModel = this;
     }
 
@@ -131,6 +144,9 @@ public partial class MainPageViewModel : ViewModelBase
         // doesn't show stale content.
         DraftTitle = value?.Title ?? string.Empty;
         DraftArticle = value?.Article ?? string.Empty;
+        // Mirror publication state too. Defaults to false on
+        // null selection so a fresh draft starts unpublished.
+        DraftIsPublished = value?.IsPublished ?? false;
         UpdateCommandStates();
     }
 
@@ -241,6 +257,46 @@ public partial class MainPageViewModel : ViewModelBase
         });
     }
 
+    /// <summary>
+    /// Toggle the publication state of the currently selected
+    /// post. Pushes the new state to
+    /// <c>PUT /api/BlogApi/{id}/publish</c> and reflects it
+    /// locally in <see cref="DraftIsPublished"/> + the
+    /// selected post so the UI updates without a full
+    /// refresh.
+    ///
+    /// <para>The toggle is its own action — separate from Save
+    /// — because <c>Publish</c> is not part of the
+    /// <c>BlogPostDto</c> payload. Bundling it into Save
+    /// would require a wire-shape change and a second server
+    /// overload; the dedicated endpoint keeps the wire
+    /// contract clean.</para>
+    /// </summary>
+    [RelayCommand]
+    internal async Task TogglePublish()
+    {
+        if (SelectedPost is null || SelectedPost.Id == 0)
+        {
+            StatusMessage = "Sélectionnez un billet existant pour changer sa publication.";
+            return;
+        }
+
+        await ExecuteAsync(async () =>
+        {
+            var desired = !DraftIsPublished;
+            await BlogClient.SetPublishAsync(SelectedPost.Id, desired);
+            DraftIsPublished = desired;
+            // Mirror into the selected post so a subsequent
+            // RefreshPostsAsync() doesn't blow away the
+            // locally flipped state until the round-trip
+            // re-hydrates it.
+            SelectedPost.IsPublished = desired;
+            StatusMessage = desired
+                ? $"Billet {SelectedPost.Id} publié."
+                : $"Billet {SelectedPost.Id} remis en brouillon.";
+        });
+    }
+
     [RelayCommand]
     internal void OpenSettings()
     {
diff --git a/src/PostIt/PostIt/Views/MainPage.axaml b/src/PostIt/PostIt/Views/MainPage.axaml
index c6e7fb10..0246857e 100644
--- a/src/PostIt/PostIt/Views/MainPage.axaml
+++ b/src/PostIt/PostIt/Views/MainPage.axaml
@@ -35,6 +35,18 @@
                 <Button Command="{Binding Delete}" Content="Delete" />
                 <Button Command="{Binding ManageAcl}" Content="ACL" />
                 <Button Command="{Binding OpenCircles}" Content="Mes cercles" />
+                <!-- Publication toggle: a CheckBox wired to
+                     DraftIsPublished. Clicking it fires
+                     TogglePublishCommand, which pushes the
+                     new state to /api/blog/{id}/publish.
+                     The CheckBox is the canonical
+                     AvaloniaXaml 'toggle' surface; binding
+                     IsChecked TwoWay keeps the visual state
+                     and the buffer in sync. -->
+                <CheckBox Content="Publié"
+                          IsChecked="{Binding DraftIsPublished, Mode=TwoWay}"
+                          Command="{Binding TogglePublishCommand}"
+                          VerticalAlignment="Center"/>
                 <!--
                     DEV ONLY: temporary shortcut to open the signature
                     capture page. Production entry point is a SignalR
diff --git a/src/Yavsc.Abstract/Blogspot/BlogPost.cs b/src/Yavsc.Abstract/Blogspot/BlogPost.cs
index 5e397245..0f88fdf8 100644
--- a/src/Yavsc.Abstract/Blogspot/BlogPost.cs
+++ b/src/Yavsc.Abstract/Blogspot/BlogPost.cs
@@ -19,6 +19,18 @@ public class BlogPostDto : IBlogPost
     public string UserModified { get; set; }
     public string Title { get; set; }
 
+    /// <summary>
+    /// Whether this post is published. Derived server-side from
+    /// the existence of a row in <c>BlogSpotPublication</c>
+    /// (a row means published, no row means draft). Not stored
+    /// on <c>BlogPost</c> — it's a computed projection of the
+    /// publication table, surfaced through the wire DTO so
+    /// clients can render the current state without a
+    /// follow-up request. Toggled via
+    /// <c>PUT /api/BlogApi/{id}/publish</c>.
+    /// </summary>
+    public bool IsPublished { get; set; }
+
     public bool AuthorizeCircle(long circleId)
     {
         throw new NotImplementedException();
diff --git a/src/Yavsc.Api.Client/BlogApiClient.cs b/src/Yavsc.Api.Client/BlogApiClient.cs
index 611c892f..cbc82358 100644
--- a/src/Yavsc.Api.Client/BlogApiClient.cs
+++ b/src/Yavsc.Api.Client/BlogApiClient.cs
@@ -70,4 +70,15 @@ public sealed class BlogApiClient
 
     public Task DeletePostAsync(long id, CancellationToken ct = default)
         => _api.CallAsync(HttpMethod.Delete, $"{_pathPrefix}/{id}", ct: ct);
+
+    /// <summary>
+    /// Set a post's publication state. <c>true</c> publishes
+    /// it (visible to anonymous readers via
+    /// <c>PermissionHandler.IsPublic</c>); <c>false</c> takes
+    /// it back to draft. Idempotent: the resulting state
+    /// matches the call, regardless of the previous state.
+    /// </summary>
+    public Task SetPublishAsync(long id, bool publish, CancellationToken ct = default)
+        => _api.CallAsync(HttpMethod.Put, $"{_pathPrefix}/{id}/publish",
+            body: new { publish }, ct: ct);
 }
diff --git a/src/Yavsc.Blogs.Tests/BlogsWebServerFixture.cs b/src/Yavsc.Blogs.Tests/BlogsWebServerFixture.cs
index 2b8bf705..1e610082 100644
--- a/src/Yavsc.Blogs.Tests/BlogsWebServerFixture.cs
+++ b/src/Yavsc.Blogs.Tests/BlogsWebServerFixture.cs
@@ -154,6 +154,12 @@ public sealed class BlogsWebServerFixture : WebHostFixture
 
     protected override async Task<WebApplication> ConfigurePipelineAsync(WebApplication app)
     {
+        // UseDeveloperExceptionPage gives full stack traces on
+        // 500s during tests — much easier to debug than the
+        // default empty InternalServerError body. Production
+        // (Yavsc.Org) wires its own exception handler; this
+        // fixture is test-only.
+        app.UseDeveloperExceptionPage();
         app.UseRouting();
         app.UseAuthentication();
         app.UseAuthorization();
diff --git a/src/Yavsc.Blogs.Tests/PublishEndpointTests.cs b/src/Yavsc.Blogs.Tests/PublishEndpointTests.cs
new file mode 100644
index 00000000..af1a26c6
--- /dev/null
+++ b/src/Yavsc.Blogs.Tests/PublishEndpointTests.cs
@@ -0,0 +1,151 @@
+using System.Net;
+using System.Net.Http;
+using System.Net.Http.Json;
+using System.Text.Json;
+using Microsoft.Extensions.DependencyInjection;
+using Yavsc.Models;
+using Yavsc.Models.Blog;
+using Yavsc.Tests.Shared;
+
+namespace Yavsc.Blogs.Tests;
+
+/// <summary>
+/// Behavioural tests for the publication toggle endpoint:
+/// <c>PUT /api/BlogApi/{id}/publish</c> with body
+/// <c>{ "publish": bool }</c>.
+///
+/// <para>The endpoint is the PostIt-facing way to toggle
+/// whether a post is publicly readable (via
+/// <c>BlogSpotPublication</c>). It does NOT change the
+/// ACL — a Public post with a non-empty ACL is still
+/// restricted to the ACL's circles for authenticated
+/// callers; only anonymous reads open up.</para>
+///
+/// <para>Same fixture as <see cref="BlogApiTests"/>:
+/// in-memory <c>ApplicationDbContext</c>, JWT bearer auth
+/// via <see cref="TestTokenIssuer"/>.</para>
+/// </summary>
+[Collection("JwtClaimMapping")]
+public sealed class PublishEndpointTests : IClassFixture<BlogsWebServerFixture>
+{
+    private readonly BlogsWebServerFixture _fixture;
+
+    public PublishEndpointTests(BlogsWebServerFixture fixture)
+    {
+        _fixture = fixture;
+    }
+
+    private void ResetDatabase()
+    {
+        using var scope = _fixture.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
+        db.Database.EnsureDeleted();
+        db.Database.EnsureCreated();
+
+        // ApplicationUser has an AlternateKey on Email; the
+        // InMemory provider refuses to track entities whose
+        // alternate key is null, so we set it explicitly.
+        db.Users.Add(new ApplicationUser
+        {
+            Id = "alice",
+            UserName = "alice",
+            Email = "alice@example.com",
+            EmailConfirmed = true,
+        });
+        db.SaveChanges();
+    }
+
+    private long SeedPost(string authorId)
+    {
+        using var scope = _fixture.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
+        var post = new BlogPost
+        {
+            AuthorId = authorId,
+            Title = $"post-by-{authorId}",
+            Article = "test",
+            DateCreated = DateTime.UtcNow,
+            DateModified = DateTime.UtcNow,
+        };
+        db.BlogSpot.Add(post);
+        db.SaveChanges();
+        return post.Id;
+    }
+
+    private string PublishUrl(long id)
+        => $"{_fixture.Addresses.First(a => a.StartsWith("https://"))}/api/v1/blog/{id}/publish";
+
+    private string BlogsUrl
+        => _fixture.Addresses.First(a => a.StartsWith("https://")) + "/api/v1/blog";
+
+    private HttpClient NewClient(string subject)
+    {
+        var handler = new HttpClientHandler
+        {
+            ServerCertificateCustomValidationCallback = (_, _, _, _) => true
+        };
+        var http = new HttpClient(handler)
+        {
+            BaseAddress = new Uri(_fixture.Addresses.First(a => a.StartsWith("https://")))
+        };
+        http.DefaultRequestHeaders.Authorization =
+            new System.Net.Http.Headers.AuthenticationHeaderValue(
+                "Bearer", TestTokenIssuer.Issue(subject));
+        return http;
+    }
+
+    [Fact]
+    public async Task PutPublish_true_returns_204_and_sets_IsPublished_in_subsequent_GET()
+    {
+        ResetDatabase();
+        var postId = SeedPost("alice");
+
+        using var http = NewClient("alice");
+        var put = await http.PutAsJsonAsync(PublishUrl(postId), new { publish = true });
+        Assert.Equal(HttpStatusCode.NoContent, put.StatusCode);
+
+        var get = await http.GetAsync($"{BlogsUrl}/{postId}");
+        Assert.Equal(HttpStatusCode.OK, get.StatusCode);
+        using var doc = JsonDocument.Parse(await get.Content.ReadAsStringAsync());
+        Assert.True(doc.RootElement.GetProperty("isPublished").GetBoolean());
+    }
+
+    [Fact]
+    public async Task PutPublish_false_returns_204_and_clears_IsPublished()
+    {
+        ResetDatabase();
+        var postId = SeedPost("alice");
+
+        using var http = NewClient("alice");
+        await http.PutAsJsonAsync(PublishUrl(postId), new { publish = true });
+        var put = await http.PutAsJsonAsync(PublishUrl(postId), new { publish = false });
+        Assert.Equal(HttpStatusCode.NoContent, put.StatusCode);
+
+        var get = await http.GetAsync($"{BlogsUrl}/{postId}");
+        using var doc = JsonDocument.Parse(await get.Content.ReadAsStringAsync());
+        Assert.False(doc.RootElement.GetProperty("isPublished").GetBoolean());
+    }
+
+    [Fact]
+    public async Task PutPublish_on_unknown_post_returns_404()
+    {
+        ResetDatabase();
+        using var http = NewClient("alice");
+        var put = await http.PutAsJsonAsync(PublishUrl(99999L), new { publish = true });
+        Assert.Equal(HttpStatusCode.NotFound, put.StatusCode);
+    }
+
+    [Fact]
+    public async Task PutPublish_by_non_author_returns_challenge()
+    {
+        ResetDatabase();
+        var postId = SeedPost("alice");
+
+        using var http = NewClient("bob");
+        var put = await http.PutAsJsonAsync(PublishUrl(postId), new { publish = true });
+        // 401 Challenge (the controller returns Challenge()
+        // for AuthorizationFailureException). The exact code
+        // is framework-dependent; what matters is "not 204".
+        Assert.NotEqual(HttpStatusCode.NoContent, put.StatusCode);
+    }
+}
diff --git a/src/Yavsc.Blogs/Controllers/BlogApiController.cs b/src/Yavsc.Blogs/Controllers/BlogApiController.cs
index 23d71742..2f97de53 100644
--- a/src/Yavsc.Blogs/Controllers/BlogApiController.cs
+++ b/src/Yavsc.Blogs/Controllers/BlogApiController.cs
@@ -139,9 +139,56 @@ namespace Yavsc.Blogs.Controllers
             return Ok(blog);
         }
 
+        /// <summary>
+        /// Toggle a post's publication state. <c>true</c> adds
+        /// a row to <c>blogSpotPublications</c> (the post
+        /// becomes publicly readable via
+        /// <c>PermissionHandler.IsPublic</c>); <c>false</c>
+        /// removes it.
+        ///
+        /// <para>PUT (not POST) because the operation is
+        /// idempotent — the resulting state is determined by
+        /// the body, not by the request. Returns 204 No
+        /// Content on success, 404 when the post does not
+        /// exist, 403 (Challenge) when the caller is not the
+        /// author.</para>
+        /// </summary>
+        // PUT: api/BlogApi/5/publish
+        // body: { "publish": true }
+        [HttpPut("{id}/publish")]
+        public async Task<IActionResult> PutPublish(
+            [FromRoute] long id,
+            [FromBody] SetPublishBody body)
+        {
+            if (!ModelState.IsValid)
+            {
+                return BadRequest(ModelState);
+            }
+
+            try
+            {
+                var ok = await blogSpotService.SetPublishAsync(User, id, body.Publish);
+                if (!ok) return NotFound();
+                return new StatusCodeResult(StatusCodes.Status204NoContent);
+            }
+            catch (AuthorizationFailureException)
+            {
+                return Challenge();
+            }
+        }
+
         protected override void Dispose(bool disposing)
         {
             base.Dispose(disposing);
         }
     }
+
+    /// <summary>
+    /// Wire body for <c>PUT /api/BlogApi/{id}/publish</c>.
+    /// Intentionally tiny: just the desired publication state.
+    /// </summary>
+    public sealed class SetPublishBody
+    {
+        public bool Publish { get; set; }
+    }
 }
diff --git a/src/Yavsc.Server/Models/ApplicationUser.cs b/src/Yavsc.Server/Models/ApplicationUser.cs
index b64bad3e..355e0ad1 100644
--- a/src/Yavsc.Server/Models/ApplicationUser.cs
+++ b/src/Yavsc.Server/Models/ApplicationUser.cs
@@ -41,31 +41,31 @@ namespace Yavsc.Models
         /// User's posts
         /// </summary>
         /// <returns></returns>
-        [InverseProperty("Author"), JsonIgnore]
+        [InverseProperty("Author"), JsonIgnore, System.Text.Json.Serialization.JsonIgnore]
         public virtual List<Blog.BlogPost>? Posts { get; set; }
 
         /// <summary>
         /// User's contact list
         /// </summary>
         /// <returns></returns>
-        [InverseProperty("Owner"), JsonIgnore]
+        [InverseProperty("Owner"), JsonIgnore, System.Text.Json.Serialization.JsonIgnore]
         public virtual List<Contact>? Book { get; set; }
 
         /// <summary>
         /// External devices using the API
         /// </summary>
         /// <returns></returns>
-        [InverseProperty("DeviceOwner"), JsonIgnore]
+        [InverseProperty("DeviceOwner"), JsonIgnore, System.Text.Json.Serialization.JsonIgnore]
         public virtual List<DeviceDeclaration>? DeviceDeclaration { get; set; }
 
-        [InverseProperty("Owner"), JsonIgnore]
+        [InverseProperty("Owner"), JsonIgnore, System.Text.Json.Serialization.JsonIgnore]
         public virtual List<ChatConnection>? Connections { get; set; }
 
         /// <summary>
         /// User's circles
         /// </summary>
         /// <returns></returns>
-        [InverseProperty("Owner"), JsonIgnore]
+        [InverseProperty("Owner"), JsonIgnore, System.Text.Json.Serialization.JsonIgnore]
 
         public virtual List<Circle>? Circles { get; set; }
 
@@ -96,28 +96,28 @@ namespace Yavsc.Models
 
         public long MaxFileSize { get; set; } = 512 * 1024 * 1024;
 
-        [JsonIgnore]
+        [JsonIgnore, System.Text.Json.Serialization.JsonIgnore]
         [InverseProperty("Owner")]
         public virtual List<BlackListed>? BlackList { get; set; }
 
         public bool AllowMonthlyEmail { get; set; } = false;
 
-        [JsonIgnore]
+        [JsonIgnore, System.Text.Json.Serialization.JsonIgnore]
         [InverseProperty("Owner")]
         public virtual List<ChatRoom>? Rooms { get; set; }
 
-        [JsonIgnore]
+        [JsonIgnore, System.Text.Json.Serialization.JsonIgnore]
         [InverseProperty("User")]
         public virtual List<ChatRoomAccess>? RoomAccess { get; set; }
 
-        [JsonIgnore]
+        [JsonIgnore, System.Text.Json.Serialization.JsonIgnore]
         [InverseProperty("Member")]
         public virtual List<CircleMember>? Membership { get; set; }
 
         /// <summary>
         /// User's blog comments
         /// </summary>
-        [JsonIgnore]
+        [JsonIgnore, System.Text.Json.Serialization.JsonIgnore]
         [InverseProperty("Author")]
         public virtual List<Blog.Comment>? BlogComments { get; set; }
 
diff --git a/src/Yavsc.Server/Models/Blog/BlogPost.cs b/src/Yavsc.Server/Models/Blog/BlogPost.cs
index 442cbb1f..213910cd 100644
--- a/src/Yavsc.Server/Models/Blog/BlogPost.cs
+++ b/src/Yavsc.Server/Models/Blog/BlogPost.cs
@@ -95,6 +95,18 @@ namespace Yavsc.Models.Blog
         [InverseProperty("Post")]
         public virtual List<Comment> Comments { get; set; }
 
+        /// <summary>
+        /// Whether this post is published. Not a column: the
+        /// existence of a row in <c>BlogSpotPublication</c>
+        /// is the source of truth. EF skips this property via
+        /// <c>[NotMapped]</c> so no migration is needed. The
+        /// service hydrates it after each fetch (single bulk
+        /// lookup, not N+1) and it surfaces through the wire
+        /// as part of the JSON-serialised <c>BlogPost</c>.
+        /// </summary>
+        [NotMapped]
+        public bool IsPublished { get; set; }
+
         IApplicationUser IBlogPost.Author => Author;
     }
 }
diff --git a/src/Yavsc.Server/Services/BlogSpotService.cs b/src/Yavsc.Server/Services/BlogSpotService.cs
index dc02cde2..423c3eac 100644
--- a/src/Yavsc.Server/Services/BlogSpotService.cs
+++ b/src/Yavsc.Server/Services/BlogSpotService.cs
@@ -115,6 +115,10 @@ public class BlogSpotService
         {
             return null;
         }
+        // Hydrate the [NotMapped] IsPublished flag from the
+        // publication table so the wire JSON carries it.
+        blog.IsPublished = await _context.blogSpotPublications
+            .AnyAsync(pub => pub.BlogpostId == blogPostId);
         var auth = await _authorizationService.AuthorizeAsync(user, blog, new ReadPermission());
         if (!auth.Succeeded)
         {
@@ -225,10 +229,31 @@ public class BlogSpotService
            .Select(p => p.BlogPost).ToArray();
         }
 
-        var data = posts.OrderByDescending(p => p.DateModified)
+        // Materialise before hydrating IsPublished: it's a
+        // computed [NotMapped] property that needs to be set
+        // on each BlogPost instance after the query runs.
+        var materialised = posts.ToList();
+
+        // Single bulk lookup for the IsPublished flag — avoid
+        // the N+1 of one AnyAsync per post. The published ids
+        // are loaded once and matched against the post list
+        // in memory.
+        var postIds = materialised.OfType<BlogPost>().Select(p => p.Id).ToList();
+        if (postIds.Count > 0)
+        {
+            var publishedIds = await _context.blogSpotPublications
+                .Where(pub => postIds.Contains(pub.BlogpostId))
+                .Select(pub => pub.BlogpostId)
+                .ToListAsync();
+            var publishedSet = publishedIds.ToHashSet();
+            foreach (var post in materialised.OfType<BlogPost>())
+                post.IsPublished = publishedSet.Contains(post.Id);
+        }
+
+        return materialised
+            .OrderByDescending(p => p.DateModified)
             .Skip(skip)
             .Take(take);
-        return data;
     }
 
     public async Task Delete(ClaimsPrincipal user, long id)
@@ -268,4 +293,55 @@ public class BlogSpotService
         .SingleOrDefaultAsync(x => x.Id == value);
     }
 
+    /// <summary>
+    /// Toggle a post's publication state. <paramref name="publish"/>
+    /// true adds a row to <c>blogSpotPublications</c> (the post
+    /// becomes visible to anonymous callers via
+    /// <see cref="PermissionHandler.IsPublic"/>); false removes
+    /// the row if present.
+    ///
+    /// <para>The post must already exist (caller must be the
+    /// author — this is gated by the controller's EditPermission
+    /// check). Returns false when the post does not exist; true
+    /// on a successful toggle.</para>
+    ///
+    /// <para>This is the same toggle the
+    /// <see cref="BlogPostEditViewModel"/>-flavoured
+    /// <see cref="Modify(ClaimsPrincipal, BlogPostEditViewModel)"/>
+    /// overload performs inline; extracted here so the
+    /// /api/blog/{id}/publish endpoint can hit it without
+    /// forcing the caller to round-trip the full BlogPost in
+    /// the request body.</para>
+    /// </summary>
+    public async Task<bool> SetPublishAsync(ClaimsPrincipal user, long postId, bool publish)
+    {
+        var blog = await _context.BlogSpot.SingleOrDefaultAsync(b => b.Id == postId);
+        if (blog == null) return false;
+
+        var auth = await _authorizationService.AuthorizeAsync(user, blog, new EditPermission());
+        if (!auth.Succeeded)
+        {
+            throw new AuthorizationFailureException(auth);
+        }
+
+        var existing = await _context.blogSpotPublications.SingleOrDefaultAsync(
+            p => p.BlogpostId == postId);
+        if (publish)
+        {
+            if (existing == null)
+            {
+                _context.blogSpotPublications.Add(new BlogSpotPublication { BlogpostId = postId });
+            }
+        }
+        else
+        {
+            if (existing != null)
+            {
+                _context.blogSpotPublications.Remove(existing);
+            }
+        }
+        await _context.SaveChangesAsync(user.GetUserId());
+        return true;
+    }
+
 }