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DevFree

Text Diff

Compare two text blocks side-by-side with line-level highlighting.

By Daniel BeglaryanUpdated May 2026

PrivateWorks OfflineNo Account

Original (A)

Changed (B)

Ignore leading/trailing whitespaceIgnore blank lines

+0 added-0 removed1 unchanged

Paste two blocks of text above to see a line-level diff.

Deep dive

About Text Diff.

Compare Two Text Blocks Side-By-Side

CipherForces Text Diff takes two text blocks — JSON configs, logs, email drafts, contract revisions, code snippets — and shows you exactly what changed line by line. Additions in green, deletions in red, context preserved. Toggle between side-by-side and unified (GitHub-style) views.

Common Use Cases

JSON / YAML diffs: Find the one field that differs between two config files.
Contract revisions: Spot inserted clauses between "v1" and "v2" of a legal document.
Log analysis: Diff the baseline log against the failing log to isolate what went wrong.
Copyediting: See every change a reviewer made to your draft.
API response debugging: Find what shifted between yesterday's successful call and today's broken one.

Key Features

Myers diff algorithm: The same algorithm Git uses — finds the minimum edit set.
Whitespace-tolerant mode: Ignore leading/trailing spaces and blank lines when they don't matter.
Word-level highlighting: Within a changed line, shows which specific words changed — not just the whole line in red/green.
Handles large inputs: Tested with 50,000-line comparisons. No lag.

Privacy: Both text blocks are diffed in your browser. Paste sensitive content (contracts, logs, API keys) without worry — nothing reaches any server.

Three steps

How to use Text Diff.

Upload your file

Drag and drop or click to select your file.

Choose settings

Adjust quality, size, or format options.

Download result

Your processed file is ready instantly.

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About Text Diff.

Compare Two Text Blocks Side-By-Side

Common Use Cases

JSON / YAML diffs: Find the one field that differs between two config files.
Contract revisions: Spot inserted clauses between "v1" and "v2" of a legal document.
Log analysis: Diff the baseline log against the failing log to isolate what went wrong.
Copyediting: See every change a reviewer made to your draft.
API response debugging: Find what shifted between yesterday's successful call and today's broken one.

Key Features

Myers diff algorithm: The same algorithm Git uses — finds the minimum edit set.
Whitespace-tolerant mode: Ignore leading/trailing spaces and blank lines when they don't matter.
Word-level highlighting: Within a changed line, shows which specific words changed — not just the whole line in red/green.
Handles large inputs: Tested with 50,000-line comparisons. No lag.

Privacy: Both text blocks are diffed in your browser. Paste sensitive content (contracts, logs, API keys) without worry — nothing reaches any server.