How do I compare text online?

Open Compare Text, paste the original version on the left and the modified version on the right (or drop two files). The diff updates immediately with additions, deletions, and in-line edits highlighted.

Is this text compare tool free?

Yes. You can compare unlimited text in the browser at no cost. Optional AI analysis only runs when you request it and a key is configured.

What is the difference between split and unified view?

Split view shows original and modified text in two columns, which is ideal for reviews. Unified view streams a single list of context, additions, and deletions, similar to a git patch.

Does compare-text.online upload my text to a server?

Comparison runs locally in your browser. Content is only sent to the server if you later enable an optional network feature such as AI analysis.

Can I compare source code and configuration files?

Yes. Text compare works on any UTF-8 text: TypeScript, Python, YAML, JSON, SQL, Markdown, logs, and more. For structured JSON, use the dedicated JSON Diff page to pretty-print and sort keys.

How is this different from git diff?

Git needs a repository and commits. Compare Text works on any two pastes or files — email drafts, portal exports, or snippets from chat — and gives a visual redline without leaving the browser.

Can I export the comparison?

Yes. Export an HTML report for stakeholders, a unified patch for engineers, or Markdown for tickets and docs after you finish reviewing the diff.

Does word-level highlighting slow down large files?

Word-level mode focuses on changed lines so unchanged regions stay fast. For extremely large dumps, compare a focused excerpt or turn off word-level highlighting temporarily.

オンラインテキスト比較 — 無料の左右 Diff

How text compare works

Compare Text runs a line-oriented comparison, then optionally tokenizes changed lines so you can see exactly which words moved. Ignore whitespace or case when you only care about semantic edits. Jump between changes with J and K, save a snapshot to history, and export a patch, HTML report, or Markdown summary for review. Nothing leaves your device unless you later choose an optional AI analysis path.

別の形式が必要ですか？ compare PDF files または compare two JSON files も compare-text.online 内で利用できます。

チームが使う理由

Split (side-by-side) and unified text compare layouts
Word-level highlighting inside changed lines
Ignore whitespace and case when needed
Change counts, similarity score, and jump-to-change
HTML / patch / Markdown export for reviews

このツールの使い方

1
Paste or drop both versions
Put the original text on the left and the modified text on the right. You can paste from the clipboard, type directly, or drop UTF-8 files such as .txt, .md, .ts, .py, .yaml, or .sql.
2
Pick split or unified view
Split view keeps columns aligned for reviews. Unified view streams a single list of context, additions, and deletions — closer to a git patch when you want a compact trail.
3
Tune noise filters
Turn on ignore whitespace or ignore case when formatting-only churn is drowning real edits. Keep word-level highlighting on when you need to see which tokens inside a line actually moved.
4
Jump, save, and export
Use Prev/Next (or K/J) to walk every change. Save a snapshot to browser history, then export HTML, patch, or Markdown when stakeholders need a durable artifact.

When to use an online text compare tool

Teams reach for compare text workflows whenever git is not the right surface: a teammate emailed two drafts, a vendor returned a clean contract without Track Changes, a hotfix landed as a pasted snippet, or a config file was edited in a portal that does not speak git. An online text compare tool closes that gap with an immediate redline. Compared with desktop merge utilities, a browser-based text compare keeps both sides visible, works on locked-down machines, and does not require installing a client. Compared with “find the difference” by eye, word-level highlighting catches silent swaps — “shall” vs “may”, renamed feature flags, or a single digit in a price table — that skimming misses under deadline pressure.

Compare text for code, config, and prose

The same engine handles source code and human prose. Developers use text compare for TypeScript refactors, SQL migrations, Terraform snippets, and Dockerfiles before a commit. Writers and legal reviewers use it for policies, help-center articles, and terms of service. Ops teams compare YAML and env-style configs across staging and production. If the payload is structured JSON, switch to the JSON Diff page so you can pretty-print and sort keys first; if the source is a PDF, use PDF Compare to extract text; if you only have screenshots, Image Diff is the right lane. Keeping each format on a purpose-built page reduces false positives and keeps the homepage focused on classic text compare intent.

Privacy-first comparison in the browser

Diffing runs locally with the same family of algorithms used by developer tools. Your paste buffer stays in memory for the session. That design matters for NDAs, customer data samples, and unreleased copy. Optional features that need a network call are explicit — you choose them; the default compare text path does not upload content just to draw a redline. When you export, you control what leaves the tab: an HTML report for email, a unified patch for engineers, or a Markdown summary for tickets.

Tips for cleaner diffs

Normalize line endings and trim trailing spaces when one side came from Windows and the other from macOS. Collapse huge minified lines by prettifying first (or use JSON Diff for objects). Compare the smallest relevant excerpt when a full dump is noisy. Save named snapshots when you iterate through several rounds of feedback so you can reopen yesterday’s redline without rebuilding it from email threads. Finally, prefer split view for approvals and unified view when you need to quote a compact change list in chat.

オンラインテキスト比較の主な用途

Code review without a git remote

Drop two function drafts, config files, or SQL scripts into the editor when you need a visual diff before a commit or after a hotfix arrived as a paste.

Policy and legal wording

Compare contract clauses, terms of service, and policy drafts to catch silent wording changes that a skim would miss under time pressure.

Support and documentation

Diff README revisions, runbooks, and help-center articles so published copy stays aligned with the latest product behavior.

Config and release notes

Compare feature-flag lists, nginx snippets, and changelog drafts between release candidates before they ship.

Localization and copy decks

Check that only intended strings changed between marketing or UI copy versions, without accidental deletions in neighboring rows.

Incident and log triage

Paste two log excerpts or error dumps to isolate the new stack frames and timestamps that appeared after a deploy.

オンラインテキスト比較 FAQ

How do I compare text online?: Open Compare Text, paste the original version on the left and the modified version on the right (or drop two files). The diff updates immediately with additions, deletions, and in-line edits highlighted.
Is this text compare tool free?: Yes. You can compare unlimited text in the browser at no cost. Optional AI analysis only runs when you request it and a key is configured.
What is the difference between split and unified view?: Split view shows original and modified text in two columns, which is ideal for reviews. Unified view streams a single list of context, additions, and deletions, similar to a git patch.
Does compare-text.online upload my text to a server?: Comparison runs locally in your browser. Content is only sent to the server if you later enable an optional network feature such as AI analysis.
Can I compare source code and configuration files?: Yes. Text compare works on any UTF-8 text: TypeScript, Python, YAML, JSON, SQL, Markdown, logs, and more. For structured JSON, use the dedicated JSON Diff page to pretty-print and sort keys.
How is this different from git diff?: Git needs a repository and commits. Compare Text works on any two pastes or files — email drafts, portal exports, or snippets from chat — and gives a visual redline without leaving the browser.
Can I export the comparison?: Yes. Export an HTML report for stakeholders, a unified patch for engineers, or Markdown for tickets and docs after you finish reviewing the diff.
Does word-level highlighting slow down large files?: Word-level mode focuses on changed lines so unchanged regions stay fast. For extremely large dumps, compare a focused excerpt or turn off word-level highlighting temporarily.