Edit PDF Online PDF Tools

When You'll Use This

PDF editing comes up more often than you might expect. Here are the most common real-world situations where this tool helps:

• Filling out forms: Type directly into fields on job applications, tax forms, or rental agreements — no printing needed.
• Reviewing documents: Highlight important clauses in a contract before signing. Add sticky notes to share feedback.
• Academic work: Annotate research papers, mark key passages in study material, or add comments to assignment PDFs.
• Adding a signature: Use the drawing tool to sign a PDF on screen and send it back without scanning anything.
• Correcting minor errors: Add a text box to correct or supplement outdated information on a document you cannot edit directly.

What You Get

• 100% private: Your file never leaves your device. Ideal for sensitive documents.
• No installs: Works on any browser — Windows, Mac, Android, or iOS.
• Multiple tools: Text, highlight, freehand draw, and shapes in one place.
• Original quality preserved: Annotations are added as a clean layer. The underlying document is not altered.
• No signup required: Edit and download without creating an account.
• Free to use: No limits on the number of files you edit.

Common Problems

• Text appears misaligned: This can happen with unusual page rotations. Try rotating the page to 0° first using our Rotate PDF tool, then re-open for editing.
• Cannot change original text: Browser-based editors add layers on top. To modify embedded text, convert the PDF to Word first, edit it there, then convert back.
• Tool is slow on large files: Files over 50 MB with many high-res images can be heavy. Use Compress PDF to reduce the size before editing.
• Download looks different from preview: Some complex page structures can shift annotations slightly. Always review the downloaded file before sharing.

Pro Tips

• Use the highlight tool for document reviews — it is easier to read than freehand marks.
• When filling forms, zoom in on the page before typing to place text more accurately.
• For a cleaner signature, draw slowly in one stroke rather than lifting and redrawing.
• Add a text box with your name and date when signing to match the format of most official documents.
• If you need to edit many pages, use Split PDF first to work on individual pages, then Merge PDF to reassemble them.

Mistakes to Avoid

• Do not overwrite your original file — always keep a backup before starting.
• Avoid placing text outside the visible page area; it will not appear in the downloaded file.
• Do not expect this tool to remove or replace existing text — use PDF to Word for that.
• Avoid using very small font sizes for form fields; they can be hard to read on printed copies.

About This Tool

This edit PDF tool was built to make basic document editing possible without any software, account, or upload. It uses pdf-lib and PDF.js — two well-established open-source libraries — to render your PDF and apply annotations as a clean vector layer over the original document. This means the base file stays intact while your additions are precisely placed on top.

The tool is designed for annotation-style editing: adding text, highlighting passages, drawing, and inserting shapes. It is not built for modifying internal document text, which requires a different technical approach. For that, use our PDF to Word converter, make changes in Word, then convert back. You can also compress your file before editing to speed things up, or merge multiple edited PDFs into one final document.

All processing happens in your browser. Your PDF is never sent to any server. This design choice was intentional — it protects sensitive documents like contracts, personal ID files, and financial records from any third-party exposure.

About the Creator

Karan Kumar builds the tools at AFFLIGO. He created this PDF editor after noticing how often people need to fill out or annotate documents but don't have PDF software at hand. The goal was simple: make it work in the browser, keep it private, and remove every unnecessary step between opening a file and downloading the result.

Karan's focus is on tools that feel straightforward and predictable. Each tool on AFFLIGO is tested to produce consistent results across devices. If you run into an issue or have a suggestion, please reach out via the contact page. Feedback directly shapes what gets improved next.