Compress PDF to 100KB, 200KB Online Free
Short answer: To compress a PDF to a target size, open the Compress to Size tool, choose your PDF, set the target size such as 100KB or 200KB, and download the result. Everything runs in your browser, with no signup and no uploads.
Shrink your PDF to an exact target size. 100% free, in your browser — no signup, no watermark, files never leave your device.
Drop your PDF here or click to browse
Max 50MB · Works on any device
✅ Compression Complete
How to compress a PDF to a target size
If your PDF is too large to send or upload, you don't need to guess at quality settings. Set the size you need, and the tool does the rest — right in your browser, with no signup and no uploads.
- Open the tool — Open the Compress to Size tool in your browser. It works on desktop and on your phone, with nothing to install.
- Choose your PDF — Select the file from your device. It opens locally in your browser, so your document is never uploaded to a server.
- Set the target size — Choose a target such as 100KB or 200KB. The tool adjusts the file to fit that size as closely as possible.
- Download and check the result — Download the compressed file and open it once. Check that the text is still readable and the images look acceptable before you send it. If the result isn't right, run your original file again with a different target — your original is never changed.
When to use it
- Email attachments — Many inboxes reject large attachments. Shrinking a PDF to a set size means your message goes through the first time, without splitting the document into pieces.
- Job portals — Application forms often cap uploads at a small size. A CV or portfolio compressed to the limit uploads cleanly instead of bouncing back with an error.
- Government forms — Official portals commonly enforce strict file-size limits. Hitting the exact target avoids a rejected submission at the last step of a long form.
- School submissions — Assignments uploaded to a learning portal must fit its limit. Compressing first saves a failed upload the night before a deadline.
Frequently Asked Questions
How do I compress a PDF to exactly 100KB?
Upload your PDF, select 100KB as the target size, and click Compress. The tool iteratively reduces image quality until the file fits under 100KB, then lets you download the result.
Will compressing to 100KB ruin my PDF quality?
Smaller targets mean more compression. Text-heavy PDFs compress well with little visible loss. Image-heavy PDFs at 100KB will show softer images. Try 200KB or 500KB if quality matters more than size.
Is my PDF uploaded to a server?
No. All compression runs 100% in your browser using pdf-lib and pdf.js. Your file never leaves your device.
What if my PDF cannot reach the target size?
The tool tries progressively stronger compression and reports the smallest size it achieved. If even maximum compression exceeds your target, it shows the best result and suggests a larger target.
Can I compress a PDF to a custom size?
Yes. Choose Custom and enter any size in KB — for example 150KB, 300KB, or 750KB.