Word-Level Diff
Compare text by words to quickly spot rewritten phrases, added terms, removed clauses, and small edits inside a sentence.
Find the difference between two texts
Paste or upload your texts below to compare them instantly
Original text
Modified text
Compare Text Online With a Fast Diff Checker
Online Data Tools is a free text compare tool for finding differences between two pieces of text. Paste your original text and changed text, then review additions, removals, and edited lines in a clear side-by-side diff view.
Use it as an online diff checker for documents, code snippets, JSON, CSV, Markdown, configuration files, logs, SQL queries, HTML, CSS, JavaScript, and plain text. The comparison runs in your browser, so your content is not uploaded to a server.
Text Comparison Features
Character-Level Diff
Switch to character comparison when a single letter, punctuation mark, number, or symbol matters.
Side-by-Side View
Review original and modified text next to each other with line numbers, colored rows, and inline highlights.
Whitespace Tools
Trim leading and trailing whitespace, or reveal spaces and tabs when invisible formatting changes need to be checked.
File Upload
Open common text-based files such as .txt, .md,.json, .csv, .xml, .html,.css, .js, .ts, .yaml,.sql, and log files.
Export Results
Save comparison reports as HTML, unified diff text, JSON, CSV, Excel, or PDF for documentation, review, and QA workflows.
How to Compare Two Texts
1
Add the original textPaste, type, or upload the first version in the left panel.
2
Add the changed textPaste, type, or upload the revised version in the right panel.
3
Find differencesClick Find difference, then move through each changed block with the diff navigator.
4
Adjust the comparisonChoose word or character mode, trim whitespace, show spaces and tabs, or hide unchanged lines.
When This Text Difference Checker Helps
Developers
Compare code snippets, JSON responses, environment files, SQL queries, and configuration changes.
Writers and Editors
Review draft revisions, rewritten paragraphs, punctuation edits, and final copy changes.
QA Engineers
Diff expected output against actual output, compare logs, and inspect test result changes.
Students and Researchers
Check assignment drafts, citations, notes, and copied text for accidental edits.
Word Diff vs Character Diff
Use word diff for normal writing, articles, emails, documentation, and longer paragraphs. It is easier to scan because it highlights changed words and phrases instead of every individual letter.
Use character diff for exact checks, such as IDs, numbers, punctuation, code, file paths, checksums, or short strings where one changed character can matter.
Related Tools
After comparing text, you may also want to count draft length with the Word Counter, format structured data with the JSON Formatter, validate patterns with the Regex Tester, or convert data with our CSV Tools.
Frequently Asked Questions
How do I compare two texts online?
Paste the original text into the left panel and the revised text into the right panel, then click Find difference. The tool shows added, removed, changed, and unchanged lines with inline highlights.
Is this text compare tool free?
Yes. Online Data Tools Text Compare is free to use and does not require sign-up, installation, or a browser extension.
Can I compare code files?
Yes. You can paste or upload text-based code and configuration files, including JavaScript, TypeScript, HTML, CSS, JSON, XML, YAML, SQL, shell scripts, Python, Markdown, and logs.
What is the difference between word and character comparison?
Word comparison highlights changed words and phrases, which is best for readable documents. Character comparison highlights individual letters, symbols, and punctuation, which is best for exact strings and code-like text.
Is my text uploaded or stored?
No. The comparison runs in your browser. Your pasted text and file contents are processed locally and are not sent to our servers.
Can I export the comparison result?
Yes. You can export the diff as an HTML report, unified diff text, JSON, CSV, Excel, or PDF.