Developer Tools
Browser-based tools for developers. All tools run locally—no data is sent to external servers.
Content Previewer
Preview Markdown, validate JSON, format XML, and compare text differences—all in your browser with no data transmission.
Markdown JSON XML Diff
Developer Passport Photo Maker
Free online passport photo maker. Remove background, resize to official dimensions, and print at home — all in your browser, no upload needed.
Remove background and replace with white — automaticallyOfficial dimension presets for US, UK, EU, Canada, Australia, ChinaArrange multiple photos on one sheet for printing (4x6, A4, Letter)
Utilities Text to Speech Reader
Free online text-to-speech tool that reads articles aloud in English and Chinese. Adjust voice, speed, and volume — runs entirely in your browser.
Read articles in English and Chinese with natural voicesAdjustable speed (0.5x–2.0x), volume, and voice selectionSentence-by-sentence navigation with visual highlighting
Utilities