Upload forms love hard limits: a job portal wants your CV under 200KB, a visa site demands a PDF below 100KB, a court e-filing caps documents at 500KB. Guessing at a "compression level" and re-trying is frustrating. Here is how to compress a PDF to an exact target size for free, with the work happening entirely in your browser.
Why a portal asks for a specific size
Servers that accept uploads set size caps to control storage and bandwidth. The number is usually arbitrary (100KB, 1MB) but the rejection is real — go one kilobyte over and the form refuses your file. The fix is to aim at or just under the limit while keeping the document as readable as possible.
How target-size compression works
Our PDF compressor has a Target size mode. It re-renders each page as an image, then runs a binary search across image-quality settings to find the highest quality whose total size still fits your target. If even the lowest quality is too big, it uses that as a best effort and tells you. This works best on scanned or image-heavy PDFs, where most of the bytes live in the page images.
Common targets and where they show up:
| Target | Typical requirement |
|---|---|
| Under 100KB | Visa / government forms, exam portals |
| Under 200KB | Job applications, college admissions, KYC |
| Under 500KB | E-filing, email attachment caps |
| Under 1MB | Most general upload fields |
Step-by-step
- Open the PDF compressor.
- Drop in your PDF (or paste it with Ctrl/Cmd+V).
- Switch to Target size and type your limit in KB.
- Click compress — it renders, tunes the quality, and builds the file.
- Download and confirm it is under the limit and still readable.
Your PDF is processed locally and is never uploaded to a server.
If it will not get small enough
- Split out pages you do not need. Fewer pages means a smaller file — use the PDF splitter to extract just the pages required.
- Accept a slightly lower quality. Text-as-image at a modest quality is still perfectly legible for most forms.
- Combine first, then compress. If you have several files, merge them and compress once for a better size/quality balance.
Note: because target mode flattens pages to images, text in the output is no longer selectable. If you must keep selectable text, use a level-based compression instead and keep the result a little larger.
FAQ
Can I compress a PDF to exactly 100KB? You can land at or just under 100KB. The tool keeps the most quality possible while staying inside your target.
Will the text stay selectable? In Target size mode, no — pages become images. Use level-based compression if you need selectable text.
Is my file uploaded? No. Compression runs entirely in your browser, so your PDF never leaves your device.
Is there a watermark? Never. The output is clean.