Diff Checker for SEO — meta descriptions, titles, alt text
Why every SEO checks character counts with Diff Checker before publishing. Browser-based, free, no signup, runs entirely on your device.
Most inputs you work with don't justify opening Word. Diff Checker is for the in-between cases — paste, transform, paste back. Browser-local, no signup, no character limits.
Run it in your browser: Diff Checker — Everything happens locally in your browser — your file never leaves your device.
Diff Checker for SEO writing
Search-friendly copy lives or dies on character counts. Title tags get truncated at ~60 characters. Meta descriptions cap around 155-160. Twitter posts at 280, LinkedIn at 3000, Instagram at 2200. Diff Checker sits next to your editor and counts in real time so you don't accidentally publish a title that gets cut off mid-sentence.
Launch the tool
No upload, no signup, no daily limit.
Frequently asked questions
Does Diff Checker save my text?
No. Diff Checker processes everything in your browser; nothing is uploaded or stored.
Is there a length limit?
Practically, several MB of text. Beyond that the browser starts to lag.
Can I trust the count for assignment / SEO purposes?
Diff Checker matches the published Unicode standard. Cross-check against the tool of record (Word, your CMS) if that's what's being graded against.
Can Diff Checker handle non-English text?
Yes — it uses Unicode-standard rules that work for most major scripts.
Related guides
- Diff Checker vs office-suite built-in counts
- Diff Checker for non-English text — Hindi, Spanish, Arabic, and more
- Diff Checker for developers — README files, docs, commit messages
- Diff Checker: a beginner's walkthrough
- Sort Lines for SEO — meta descriptions, titles, alt text
- Find & Replace for SEO — meta descriptions, titles, alt text
Ready to try it?
Run it in your browser: Diff Checker. Runs entirely on your device using open web standards.
Last reviewed May 2026. File-size limits, portal requirements, and software defaults change over time — always verify with the destination platform before uploading time-sensitive documents. References to third-party services and products are for descriptive purposes only and do not imply any partnership or endorsement.