# MarsEdit changelog

> A desktop blog editor for WordPress and other platforms, on the Mac since 2004.

- Vendor: Red Sweater Software
- Category: Productivity
- Platforms: macOS
- Official site: https://redsweater.com/marsedit/
- Tracked by: What's New (https://whatsnew.fyi/product/marsedit)
- Harvested from: Update feed
- Entries below: 15 (newest first)

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

## Releases

### 5.4.5 — MarsEdit 5.4.5

- Date: 2026-08-12
- Version: 5.4.5
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.4.5
- Labels: Platforms: macOS

- **fixed** — Reduced flickering and reloading of embedded content in the live preview window
- **changed** — Dramatically improved typing and scrolling performance in plain text mode with long posts
- **fixed** — Improved problems that could cause sections of text to have stale syntax highlighting
- **fixed** — Markdown list notation that uses only 2 or 3 spaces per indent is now rendered correctly in the live preview
- **fixed** — Restored expected behavior when preview content is pinned to the bottom while writing a long post
- **fixed** — Restored the ability to use the space key in the main post list to scroll through posts one at a time
- **fixed** — Fixed a bug that could cause long text values to truncate instead of growing the pertinent text field
- **fixed** — Fixed a bug that could cause successful blog refreshes after a failed one to fail to save to disk
- **fixed** — Fixed a bug that could cause a post to publish twice if a network connection drop occurred during posting
- **fixed** — Fixed a bug that could cause an authentication panel to appear repeatedly after canceling it
- **fixed** — Fixed a bug that caused the wrong post to be opened when double clicking shortly after changing the selected blog
- **fixed** — Fixed multiple bugs that could cause a crash when the server returns an unexpected result
- **fixed** — Fixed a number of memory over-usage problems
- **fixed** — Fixed a bug where dragging the last Published image from the Media window failed to add the image to the targeted post
- **fixed** — Fixed a bug that could cause a toolbar icon to appear with inverted colors
- **security** — Improved security when the server tries to redirect from an HTTPS to an HTTP URL
- **fixed** — Posts whose date can't be parsed no longer display and sort as January 1, 2001
- **fixed** — The Crash Reporter now avoids re-submitting old crash logs when the app terminates unexpectedly
- **fixed** — Fixed a bug that caused posts set as Private to be set as Draft instead
- **fixed** — Fixed a bug that could cause posts containing certain phrases to signal a connection error
- **fixed** — Photos attached to a Tumblr post are no longer silently dropped when publishing needs to authenticate or retry

MarsEdit 5.4.5
- Reduced flickering and reloading of embedded content in the live preview window
- Dramatically improved typing and scrolling performance in plain text mode with long posts
- Improvements to problems that could cause sections of text to have stale syntax highlighting
- Markdown list notation that uses only 2 or 3 spaces per indent is now rendered correctly in the live preview
- Restored expected behavior when preview content is “pinned” to the bottom while writing a long post
- Restored the ability to use the space key in the main post list to scroll through posts one at a time
- Fixed a bug that could cause long text values to truncate instead of growing the pertinent text field
- Fixed a bug that could cause successful blog refreshes after a failed one to fail to save to disk
- Fixed a bug that could cause a post to publish twice if a network connection drop occurred during posting
- Fixed a bug that could cause an authentication panel to appear repeatedly after canceling it
- Fixed a bug that caused the wrong post to be opened when double clicking shortly after changing the selected blog
- Fixed multiple bugs that could cause a crash when the server returns an unexpected result
- Fixed a number of memory over-usage problems
- Fixed a bug where dragging the last “Published” image from the Media window failed to add the image to the targeted post
- Fixed a bug that could cause a toolbar icon to appear with inverted colors
- Improved security when the server tries to redirect from an HTTPS to an HTTP URL
- Posts whose date can't be parsed no longer display and sort as January 1, 2001
- The Crash Reporter now avoids re-submitting old crash logs when the app terminates unexpectedly
- Tumblr specific improvements
- Fixed a bug that caused posts set as “Private” to be set as “Draft” instead
- Fixed a bug that could cause posts containing certain phrases to signal a connection error
- Photos attached to a Tumblr post are no longer silently dropped when publishing needs to authenticate or retry

### 5.4.4 — MarsEdit 5.4.4

- Date: 2026-07-21
- Version: 5.4.4
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.4.4
- Labels: Platforms: macOS

- **added** — Animated GIFs are now shown with animation in the Upload Utility preview
- **changed** — When pasting an image, if animated GIF and TIFF data are both available, the animated item is now preferred
- **fixed** — Fixed an issue that caused some changed sidebar options such as author and pingbacks not to be set correctly on new posts
- **fixed** — Protected against a crash when running on an upcoming release of macOS
- **fixed** — Fixed some memory over-usage issues

MarsEdit 5.4.4
- Animated GIFs are now shown with animation in the Upload Utility preview
- When pasting an image, if animated GIF and TIFF data are both available, the animated item is now preferred
- Fixed an issue that caused some changed sidebar options such as author and pingbacks not to be set correctly on new posts
- Protected against a crash when running on an upcoming release of macOS
- Fixed some memory over-usage issues

### 5.4.3 — MarsEdit 5.4.3

- Date: 2026-03-27
- Version: 5.4.3
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.4.3
- Labels: Platforms: macOS

- **fixed** — Restored functionality of the Upload Utility window
- **changed** — Extended the syncing of spell check options to more text fields in the app
- **fixed** — Restored the photo icon to the Micropost panel's image-choosing button
- **fixed** — Fixed a bug that caused published posts to show the wrong Edited Date
- **fixed** — Fixed the punctuation and placement of buttons in the crash reporter
- **removed** — Removed non-applicable Move and Rename menu items

MarsEdit 5.4.3
- Restored functionality of the "Upload Utility" window
MarsEdit 5.4.2 contained these changes:
- Extended the syncing of spell check options to more text fields in the app
- Restored the photo icon to the Micropost panel's image-choosing button
- Fixed a bug that caused published posts to show the wrong "Edited Date"
- Fixed the punctuation and placement of buttons in the crash reporter
- Removed non-applicable Move and Rename menu items

### 5.4.2 — MarsEdit 5.4.2

- Date: 2026-03-26
- Version: 5.4.2
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.4.2
- Labels: Platforms: macOS

- **changed** — Extended the syncing of spell check options to more text fields in the app
- **added** — Restored the photo icon to the Micropost panel's image-choosing button
- **fixed** — Fixed a bug that caused published posts to show the wrong Edited Date
- **fixed** — Fixed the punctuation and placement of buttons in the crash reporter
- **removed** — Removed non-applicable Move and Rename menu items

MarsEdit 5.4.2
- Extended the syncing of spell check options to more text fields in the app
- Restored the photo icon to the Micropost panel's image-choosing button
- Fixed a bug that caused published posts to show the wrong "Edited Date"
- Fixed the punctuation and placement of buttons in the crash reporter
- Removed non-applicable Move and Rename menu items

### 5.4.1 — MarsEdit 5.4.1

- Date: 2026-03-18
- Version: 5.4.1
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.4.1
- Labels: Platforms: macOS

- **fixed** — Fix a bug from Version 5.4 that caused edits to existing posts to publish as new posts
- **changed** — Standard macOS Versions now work as expected with Revert to menu item
- **added** — The Send to MarsEdit share extension now supports sending text to MarsEdit
- **fixed** — Fixed a bug that removed images from Tumblr posts published with Micro Post panel
- **fixed** — Fixed syntax coloring bugs affecting Markdown in the plain text editor
- **fixed** — Fixed a bug that allowed styled text to be pasted into the Find & Replace text fields
- **fixed** — Fixed an issue that could cause a drawing glitch in the plain text editor after deleting text
- **fixed** — Fixed a flash of white when opening a post in Rich Text editor in Dark Mode
- **changed** — Improved handling of WordPress permission errors when the blog is not English language
- **changed** — Restored animation when closing the Options side panel

MarsEdit 5.4.1
- Fix a bug from Version 5.4 that caused edits to existing posts to publish as new posts
MarsEdit 5.4 contained these changes:
- Standard macOS "Versions" now work as expected with "Revert to" menu item
- The "Send to MarsEdit" share extension now supports sending text to MarsEdit
- Fixed a bug that removed images from Tumblr posts published with Micro Post panel
- Fixed a couple syntax coloring bugs affecting Markdown in the plain text editor
- Fixed a bug that allowed styled text to be pasted into the Find & Replace text fields
- Fixed an issue that could cause a drawing glitch in the plain text editor after deleting text
- Fixed a flash of white when opening a post in Rich Text editor in Dark Mode
- Improved handling of WordPress permission errors when the blog is not English language
- Restored animation when closing the Options side panel

### 5.4 — MarsEdit 5.4

- Date: 2026-03-17
- Version: 5.4
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.4
- Labels: Platforms: macOS

- **added** — Standard macOS Versions now work as expected with Revert to menu item
- **added** — The Send to MarsEdit share extension now supports sending text to MarsEdit
- **fixed** — Fixed a bug that removed images from Tumblr posts published with Micro Post panel
- **fixed** — Fixed syntax coloring bugs affecting Markdown in the plain text editor
- **fixed** — Fixed a bug that allowed styled text to be pasted into the Find & Replace text fields
- **fixed** — Fixed an issue that could cause a drawing glitch in the plain text editor after deleting text
- **fixed** — Fixed a flash of white when opening a post in Rich Text editor in Dark Mode
- **changed** — Improved handling of WordPress permission errors when the blog is not English language
- **changed** — Restored animation when closing the Options side panel

MarsEdit 5.4
- Standard macOS "Versions" now work as expected with "Revert to" menu item
- The "Send to MarsEdit" share extension now supports sending text to MarsEdit
- Fixed a bug that removed images from Tumblr posts published with Micro Post panel
- Fixed a couple syntax coloring bugs affecting Markdown in the plain text editor
- Fixed a bug that allowed styled text to be pasted into the Find & Replace text fields
- Fixed an issue that could cause a drawing glitch in the plain text editor after deleting text
- Fixed a flash of white when opening a post in Rich Text editor in Dark Mode
- Improved handling of WordPress permission errors when the blog is not English language
- Restored animation when closing the Options side panel

### 5.3.12 — MarsEdit 5.3.12

- Date: 2026-01-12
- Version: 5.3.12
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.3.12
- Labels: Platforms: macOS

- **fixed** — Fixed a bug that caused font panel changes not to be registered as expected in the Rich Text editor
- **fixed** — Fixed a bug that caused a blank overlay window to appear below title field
- **fixed** — Fixed a crash that could occur when processing an unexpected response from the blog server
- **removed** — Removed an unnecessary animated hiding of the status bar when opening a new document

MarsEdit 5.3.12
- Fixed a bug that caused font panel changes not to be registered as expected in the Rich Text editor
- Fixed a bug that caused a blank "overlay" window to appear below title field
- Fixed a crash that could occur when processing an unexpected response from the blog server
- Removed an unnecessary animated hiding of the status bar when opening a new document

### 5.3.10 — MarsEdit 5.3.10

- Date: 2025-11-28
- Version: 5.3.10
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.3.10
- Labels: Platforms: macOS

- **fixed** — Fixed a crash that could occur when closing a post document
- **changed** — Improved performance when autocompleting tags from a large list of previously used terms
- **added** — Most text fields in the post editor, including Title, now grow vertically as needed to their text
- **fixed** — Fixed a bug introduced in Version 5.3.8 that prevented resizing fields from adapting to window size changes
- **changed** — Clearing the content of the Enclosure panel now completely removes the enclosure from the post

MarsEdit 5.3.10
- Fixed a crash that could occur when closing a post document
- Improved performance when autocompleting tags from a large list of previously used terms
- Most text fields in the post editor, including Title, now grow vertically as needed to their text
- Fix a bug introduced in Version 5.3.8 that prevented these resizing fields from adapting to window size changes
- Clearing the content of the Enclosure panel now completely removes the enclosure from the post

### 5.3.8 — MarsEdit 5.3.8

- Date: 2025-10-04
- Version: 5.3.8
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.3.8
- Labels: Platforms: macOS

- **changed** — Updated the icon to fit the expected macOS 26 style
- **fixed** — Fix a bug that prevented the website icon for a blog from being downloaded correctly
- **changed** — Restore integration with NetNewsWire Share functionality
- **fixed** — Address an issue that caused garbled text in some editing fields when running the latest macOS

MarsEdit 5.3.8
- Updated the icon to fit the expected macOS 26 style
- Fix a bug that prevented the website icon for a blog from being downloaded correctly
- Restore integration with NetNewsWire "Share" functionality
- Address an issue that caused garbled text in some editing fields when running the latest macOS

### 5.3.7 — MarsEdit 5.3.7

- Date: 2025-09-16
- Version: 5.3.7
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.3.7
- Labels: Platforms: macOS

- **fixed** — Restore proper selection of interior of HTML tags when applying formatting macros
- **fixed** — Fix a bug that caused images to disappear from a post after choosing to 'Upload Now'

MarsEdit 5.3.7
- Restore proper selection of interior of HTML tags when applying formatting macros
- Fix a bug that caused images to disappear from a post after choosing to "Upload Now"

### 5.3.6 — MarsEdit 5.3.6

- Date: 2025-09-13
- Version: 5.3.6
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.3.6
- Labels: Platforms: macOS

- **fixed** — Restored browser integration functionality that was broken in version 5.3.5

MarsEdit 5.3.6
- Quick fix to an issue with 5.3.5 that broke browser integration functionality

### 5.3.5 — MarsEdit 5.3.5

- Date: 2025-09-12
- Version: 5.3.5
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.3.5
- Labels: Platforms: macOS

- **changed** — Improve launch time performance
- **added** — Allow "Duplicate Post" to be invoked on more than one selected post
- **fixed** — Fix a crash that could occur when opening the main window or document sidebars
- **fixed** — Fix minor layout issues in the Media Manager window

MarsEdit 5.3.5
- Improvements to launch time performance
- "Duplicate Post" can now be invoked to duplicate more than one selected post
- Fix a crash that could occur when opening the main window or document sidebars
- Minor layout fixes in the Media Manager window

### 5.3.4 — MarsEdit 5.3.4

- Date: 2025-04-14
- Version: 5.3.4
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.3.4
- Labels: Platforms: macOS

- **changed** — Improved performance of handling blogs with large numbers of posts
- **fixed** — Fix a crash when opening Settings with no blog selected
- **fixed** — Fix misplaced text overlapping the buttons in the Add Blog window
- **fixed** — Fix an issue that could cause the plain text editor to crash while editing very large posts
- **fixed** — Fix a bug that could cause the wrong value for Micropost tags and category defaults to show
- **fixed** — Fix AppleScript references to posts by index

MarsEdit 5.3.4
- Improved performance of handling blogs with large numbers of posts
- Fix a crash when opening Settings with no blog selected
- Fix misplaced text, overlapping the buttons in the "Add Blog" window
- Fix an issue that could cause the plain text editor to crash while editing very large posts
- Fix a bug that could cause the wrong value for Micropost tags and category defaults to show
- Fix AppleScript references to posts by index

### 5.3.3 — MarsEdit 5.3.3

- Date: 2025-03-10
- Version: 5.3.3
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.3.3
- Labels: Platforms: macOS

- **added** — Enable the Excerpt field on Micro.blog blogs to edit Summary text
- **fixed** — Fix a crash that could occur when editing long lines in the plain text editor
- **fixed** — Fix a bug that prevented the JavaScript browser bookmarklet from working on some sites
- **fixed** — Fix a bug that caused duplicated text when using dictation in rich text
- **changed** — Differentiate errors from Jetpack about IP address being flagged from regular login failures
- **changed** — Handle Too Many Requests responses more intelligently, retrying after the recommended delay if possible
- **fixed** — Fix a bug that could cause the New Blog panel to get very tall and not shrink again
- **fixed** — Fix a bug that prevented the non-Safari browser bookmarklet from working on some sites
- **removed** — Remove media assets from the list of posts returned by AppleScript

MarsEdit 5.3.3
- Enabled the Excerpt field on Micro.blog blogs to edit “Summary” text
- Fix a crash that could occur when editing long lines in the plain text editor
- Fix a bug that prevented the JavaScript browser bookmarklet from working on some sites
- Fix a bug that caused duplicated text when using dictation in rich text
- Differentiate errors from Jetpack about IP address being flagged from regular login failures
- Handle "Too Many Requests" responses more intelligently, retrying after the recommended delay if possible
- Fix a bug that could cause the "New Blog" panel to get very tall and not shrink again
- Fix a bug that prevented the non-Safari browser bookmarklet from working on some sites
- Remove media assets from the list of "posts" returned by AppleScript

### 5.3.2 — MarsEdit 5.3.2

- Date: 2025-02-02
- Version: 5.3.2
- Original notes: https://redsweater.com/marsedit/appcast5.php
- Permalink: https://whatsnew.fyi/product/marsedit/releases/5.3.2
- Labels: Platforms: macOS

- **fixed** — Fix a crash that could occur when a bad URL is provided for a blog
- **fixed** — Fix a crash that could occur when adding a blog if autoconfiguration failed

MarsEdit 5.3.2
- Fix a crash that could occur when a bad URL is provided for a blog
- Fix a crash that could occur when adding a blog if autoconfiguration failed