Compress PDF to 150KB Online Free — No Quality Loss
Compress any PDF to under 150KB for strict upload limits, email or exam forms. Free browser-based compressor — no signup, no upload.
Some exam portals and government forms enforce a strict 150KB limit for uploaded documents. A typical scan or exported PDF is 3–10x larger than this.
This tool compresses your PDF to sit just under the 150KB mark while keeping text readable. Everything runs in your browser — your file never leaves your device.
Compress your PDF to under 150KB — free
Identity proof — keep it legible, Aadhaar watermark visible.
Scanned documents are rasterised and re-encoded to land safely under the portal's KB limit. If the source is already under the limit it is passed through unchanged. Always keep a copy of the original file.
Upload a PDF to preview the compressed result.
Exam PDF Compressor runs entirely in your browser — no document ever leaves your device. Multi-page and batch files are supported; batch downloads come as a ZIP.
150KB compression target
- Target: under 150KB PDF output.
- Best for: strict exam form limits, lightweight document sharing.
- Text stays readable — images may be reduced more aggressively.
How to compress a PDF to 150KB
- 1
Upload the PDF
Drag your large PDF into the tool.
- 2
Set target to 150KB
Enter 150 in the target KB field.
- 3
Process
The compressor re-rasterizes pages and tunes quality until the file sits under 150KB.
- 4
Preview and download
Check the readability score and page preview, then download the compressed PDF.
Pro tips
- 150KB is a tight limit — text-heavy PDFs compress best.
- If the output is slightly over 150KB, try a lower DPI setting.
- Preview the compressed PDF zoomed-in to check that dates and numbers remain legible.
Frequently asked questions
Will compression to 150KB make my PDF blurry?
The tool re-rasterizes at a controlled resolution and picks the highest quality that still meets 150KB. Text-heavy PDFs stay readable; image-heavy ones may show more compression.
Can I compress a scanned PDF to 150KB?
Yes — scanned PDFs compress well because the tool re-encodes the raster data at a controlled quality level.
What if my PDF is already under 150KB?
The tool will detect this and skip unnecessary recompression. You can still run it to verify the output size.
Is my PDF uploaded anywhere?
No — compression runs entirely in your browser using PDF.js and canvas, so your PDF never leaves your computer.