Text Diff Checker
Compare two blocks of text line by line and see additions, deletions and unchanged lines colour-coded — great for editing revisions.
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About Text Diff Checker
Designed for efficiency and accuracy, Text Diff Checker compare two blocks of text line by line and see additions, deletions and unchanged lines colour-coded — great for editing revisions. Using it is a three-step job: 1) Paste the original text into the left box, 2) Paste the revised text into the right box, 3) The diff view shows additions in green, deletions in red, and unchanged lines in normal text. Built as a focused utility in our text & analysis library, it is available in a modern desktop or mobile browser without requiring account registration or software installation.
Text Diff Checker is a free, browser-based text diff from ProfitTool. Compare two blocks of text line by line and see additions, deletions and unchanged lines colour-coded — great for editing revisions. Review any usage notes shown on this page before relying on its availability. Review the tool's data-handling notice before entering sensitive information; some features store settings locally or contact external services.
If you came here from the AI-Sounding Text Checker, try Whitespace Cleaner to finish the job.
How to use Text Diff Checker
- 1Paste the original text into the left box.
- 2Paste the revised text into the right box.
- 3The diff view shows additions in green, deletions in red, and unchanged lines in normal text.
Working alongside the Freelance Contract Red Flag Checker? AI-Sounding Text Checker handles the follow-up case.
Popular Use Cases
- Case 1Draft social posts, ad copy and email subject lines that fit strict character limits.
- Case 2Clean up notes, transcripts and pasted PDF text before publishing.
- Case 3Prep essays and long-form articles for editors, professors or publication.
- Case 4Transform copy for SEO — slugs, metadata, hashtags and structured snippets.
Pro Tips & Best Practices
- Paste plain text (not rich HTML) for the fastest, cleanest results.
- Use the counter alongside the tool so you always know when you're at the limit.
- Check whether this tool keeps state in the page, your browser, or a connected service before entering sensitive text.
Common Mistakes to Avoid
Counting with spaces when the platform doesn't
Some ad platforms count characters excluding spaces, others include them. Always check both numbers before you submit a campaign — a rejected ad costs you a day.
Pasting rich text straight from Word
Invisible formatting characters, smart quotes and non-breaking spaces travel with the paste and break your CMS. Convert to plain text first.
Writing to the maximum instead of the sweet spot
Google truncates titles near 60 characters on mobile. Aim for 50–57 so your keyword survives the cut.
Already used our Whitespace Cleaner? Freelance Contract Red Flag Checker covers the other half of the workflow.
Key Terms Explained
- Character limit
- The maximum number of characters a platform will display before it truncates your text. Twitter/X allows 280, Google titles render around 60 and meta descriptions around 160.
- Reading time
- An estimate based on an average adult reading speed of 200–250 words per minute. Publishers use it to set expectations above the fold.
- Whitespace normalisation
- Collapsing duplicated spaces, tabs and line breaks so pasted text from PDFs or Word behaves predictably.
- Slug
- The URL-safe, lowercase, hyphenated version of a title used in web addresses.
Why this matters
Text is the raw material of everything you publish — an ad headline, a product description, a university essay or a support reply. Getting the length, casing and structure right is the difference between copy that ships and copy that gets rejected by a character limit, an editor or a search engine.
Frequently Asked Questions
Is this a word-level diff?›
It's a line-level diff, which is easier to read for prose. For word-level diffs, use a code review tool like GitHub.
Does it work for code?›
Yes — but for large code diffs a proper git-based tool will be faster to read.
Is there a character or word limit in Text Diff Checker?›
Input limits and handling depend on Text Diff Checker. Check the page's field guidance; for long documents, try a representative section first and review whether the page sends text to an external service.
Is my data safe when I use this text diff?›
Data handling varies by tool. Read the notice above the workspace to see whether your input stays in the browser or is sent to a named provider or service. Avoid entering sensitive information unless you understand that tool's handling.
Does Text Diff Checker keep my formatting when I paste from Word or Google Docs?›
Formatting behavior depends on the input field. If the tool expects plain text, paste without formatting and review the result before publishing.
How is Text Diff Checker different from other online text diff tools?›
It does one job without pop-ups, forced sign-in or interstitials, and remembers your settings between visits so repeat work takes seconds.
Can I use Text Diff Checker for non-English text?›
Language and character support depend on the operation. Check the output for the language and symbols you plan to use, especially when counting or transforming emoji and combining characters.
Do I need to install anything to use Text Diff Checker?›
No installation, extension or account. Open the page and start — you can also add it to your home screen for one-tap access.
Why does my text diff result differ from the count in another app?›
Different apps may treat whitespace, punctuation, and emoji differently. Check Text Diff Checker's definition and displayed breakdown against the target platform's rules.