PDF Tool
Highlight PDF Online
Highlight PDF pages with a colored banner.
For per-line/text highlights with drag-to-select, use our PDF Editor.
Your files are processed locally and never uploaded to a server.
About Highlight PDF Online
Highlight PDF Online adds a translucent colour banner across the pages you choose — a fast way to flag important pages.
How to use Highlight PDF Online
- 1Upload a PDF.
- 2Choose pages and highlight color.
- 3Click Highlight & Download.
Why use Highlight PDF Online
- 100% free with no signup and no watermark
- Runs entirely in your browser — files never leave your device
- Works on Windows, macOS, Linux, Android and iOS
- One-click download of the finished PDF
- Colour any page
- Fast mark-up
- No upload
Frequently asked questions
What does the Highlight PDF Online tool do?
Highlight PDF Online lets you highlight pdf pages with a colored banner. It runs entirely inside your browser so your files stay on your device — nothing is uploaded to a server.
Is Highlight PDF Online really free to use?
Yes. Highlight PDF Online is 100% free, with no signup, no watermark and no daily limit. You can process as many PDFs as you want.
Do I need to install any software?
No. Highlight PDF Online is a web-based tool that works in any modern browser — Chrome, Edge, Safari, Firefox and Brave — on Windows, macOS, Linux, Android and iOS.
Are my files safe with Highlight PDF Online?
Yes. Highlight PDF Online processes every file on the client side using JavaScript. Your PDF is never uploaded, stored or shared. Close the tab and it's gone.
Does Highlight PDF Online work on mobile devices?
Yes. Highlight PDF Online is fully responsive and works on Android phones, iPhones and iPads. Just open the page in your browser and pick a file.
Is there a file-size limit for Highlight PDF Online?
We recommend files under 100 MB for the smoothest experience. Larger files may work but can slow down older devices because everything is processed in your browser.
Will Highlight PDF Online reduce the quality of my PDF?
Highlight PDF Online keeps the original quality wherever possible. Any quality trade-offs (for example when compressing or exporting to images) are clearly labelled and controlled by you.
Can I use Highlight PDF Online without an internet connection?
You need internet to load the page the first time. After that, most processing happens locally in your browser — the PDF itself never travels over the network.
Does Highlight PDF Online add a watermark?
No. Files produced by Highlight PDF Online are clean, watermark-free and safe to share professionally or submit to official portals.
Can I use Highlight PDF Online for commercial or client work?
Yes. There are no licensing restrictions on the output — use it for freelance projects, agency work, client deliverables or internal business documents.
Which PDF versions does Highlight PDF Online support?
Highlight PDF Online supports standard PDF 1.4–1.7 files created by Word, Google Docs, Adobe Acrobat, printers, scanners and mobile apps. Encrypted PDFs must be unlocked first.
Why is my PDF password-protected file rejected?
For security we don't process encrypted PDFs. Use our PDF Password Remover first (if you have the password), then run the file through Highlight PDF Online.
Can I highlight pdf online more than one file at once?
Yes — where it makes sense (for example merging or converting), Highlight PDF Online accepts multiple files at once and processes them in a single click.
What browsers work best with Highlight PDF Online?
Any Chromium-based browser (Chrome, Edge, Brave, Opera) or the latest Safari and Firefox will give the best speed. Older browsers may lack the modern APIs the tool relies on.
Does Highlight PDF Online keep my PDF's bookmarks and links?
Structural features like bookmarks, hyperlinks and metadata are preserved wherever the operation allows. Conversions to image formats (JPG, PNG, PPT) naturally flatten these into pixels.
How long does Highlight PDF Online take?
Most PDFs under 20 MB finish in a few seconds on a modern laptop or phone. Larger files take proportionally longer because everything is computed on your device.
Can I undo an operation performed by Highlight PDF Online?
Highlight PDF Online never modifies your original file — it creates a new PDF and downloads it. Your source file on disk stays exactly as it was.
Do you store logs of my uploads?
We can't — nothing is uploaded. There are no server logs of your file names or contents because your PDF never leaves the browser tab.
Is Highlight PDF Online better than desktop apps like Adobe Acrobat?
For quick one-off jobs, Highlight PDF Online is faster: no install, no license, no waiting. Acrobat is still the choice for heavy editing workflows — Highlight PDF Online covers 90% of everyday needs.
How can I report a bug or request a feature?
Use the contact page linked in the footer. We read every message and roll fixes and improvements into Highlight PDF Online regularly.