Quick answer: All 11 PDF tools on Anchor AI Tools work inside your browser: the file is opened and changed on your own device with PDF.js and pdf-lib, and nothing is uploaded. Pick a tool below to edit, merge, split, compress, convert, rotate, sign, watermark, number, annotate or fill a PDF. There is no account, no daily limit and no watermark on the result.
All 11 PDF tools
Which PDF tool do you need?
| Task | Tool |
|---|---|
| Change text or images already in a PDF | PDF Editor |
| Combine files into one | Merge PDF |
| Take out or delete pages | Split PDF |
| Make a file small enough to email or upload | Compress PDF |
| Turn photos into a PDF, or a PDF into images or text | PDF Converter |
| Fix sideways pages | Rotate PDF |
| Sign a contract or form | Sign PDF |
| Complete an application or tax form | Fill PDF Form |
| Mark a draft or confidential copy | Watermark PDF |
| Number the pages of a report | Add Page Numbers |
| Review and comment | Annotate PDF |
Why nothing is uploaded
Every tool here runs on PDF.js, Mozilla’s open-source PDF engine, and pdf-lib, an open-source library for editing PDFs, inside your browser tab. Your file is read into memory on your device, changed there and saved back to your device. It is never sent to a server, stored or seen by anyone else. You can confirm this with the 60-second network test in the PDF safety guide.
| Anchor AI Tools PDF tools | Typical upload-based sites | |
|---|---|---|
| File uploaded to a server | No | Yes |
| Account required | No | Often for extra features |
| Watermark on output | No | Sometimes on free plans |
| Daily task limits | No | Common on free plans |
| Works offline after loading | Yes, for most tools | No |
Common PDF workflows
- Apply for a job: merge CV and certificates, compress under the portal limit.
- Sign and return a contract: fill the form, sign, flatten and send.
- Send scanned paperwork: rotate, reorder, remove blanks, compress.
- Share a draft: watermark it DRAFT and add page numbers.
PDF size limits to know
| Destination | Typical limit |
|---|---|
| Gmail attachment | 25 MB |
| Outlook attachment | 20 MB |
| Job and government portals | Often 2 to 10 MB |
| Most messaging apps | Varies; compress large scans first |
Glossary
| Term | Meaning |
|---|---|
| Flatten | Turn form fields and annotations into fixed page content. |
| Page range | A list of pages such as 1-3, 7, 10-12. |
| DPI | Dots per inch: image resolution. 150 for screen, 300 for print. |
| Fillable form | A PDF with interactive fields you can type into. |
| Redaction | Permanently removing sensitive content from a page. |
Guides that explain the maths
Frequently asked questions
Are these PDF tools free?
Yes. All 11 are free with no account, no daily limit and no watermark.
Are my PDF files uploaded?
No. Every tool processes files inside your browser with PDF.js and pdf-lib. Nothing is sent to a server.
Do the PDF tools work on a phone?
Yes, in any modern mobile browser. Very large files are faster on a computer.
Can I edit a scanned PDF?
A scan is an image, so you can annotate, sign, rotate, split and compress it, but retyping the text needs OCR.
What is the maximum file size?
There is no fixed limit, because processing uses your device’s memory. Files of a few hundred MB can be slow on older phones.
Which browsers are supported?
Current versions of Chrome, Edge, Firefox and Safari.
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Content Lead, Anchor AI Tools, California, USA. Spotted an error? Email hello@anchoraitools.com and it will be checked and corrected. See our editorial standards.