Data & Text
Text Diff Viewer
Paste two texts side-by-side and instantly see what changed — additions highlighted in green, deletions in red, unchanged lines in grey. It also builds a compact change review pack with counts, changed-line ranges, risk prompts, and a PR/release checklist that intentionally omits raw changed line contents.
Runs in your browser
Nothing uploaded
Free, no signup
Ctrl + Enter to run · Recent brings back your last inputs · Everything stays in this browser
FAQ
Text Diff Viewer: questions
How does the diff algorithm work?
This tool uses a longest-common-subsequence (LCS) diff, the same approach used by git diff and Unix diff. It finds the minimal set of additions and deletions to transform text A into text B.
What is the change review pack?
It is a copyable markdown handoff for PRs, tickets, and release notes. The pack includes counts, line ranges, risk prompts, and a checklist, but omits raw changed line contents so you can share review context with less accidental data exposure.
Can I diff code?
Yes — the diff is purely text-based, so it works on any language. For code, pair the review pack with the formatter, parser, test, or smoke path that verifies the changed file type.
JSON Formatter & Validator
Pretty-print & validate JSON
Image Resize Calculator
Calculate new dimensions while preserving aspect ratio
Password Strength Checker
Analyze password entropy and weaknesses
YAML ↔ JSON Converter
Convert between YAML and JSON
JSON to YAML
Convert JSON to YAML format
JSON Schema Generator
Infer and validate API contracts
Made something with AI? Share it as a private link.
Drop in the HTML from Claude, ChatGPT or any editor and get a link your client can open anywhere — with a password, view tracking, comments and approval.