Reduce a PDF's size without losing readability
Compress a copy and inspect the pages that matter most before sending it.
Follow the method ↓
The answer in 30 seconds
A PDF may be large because of high-resolution scans, images, embedded fonts or attachments. A smaller file is useful only if essential text, diagrams and signatures remain legible and the recipient accepts it.
Keep the original, create a reduced-size copy, compare file sizes and zoom into small print, scans and diagrams before using the compressed version.
Examples to adapt
Check handwriting and small print after compression.
Inspect charts and images at the zoom level the reader will use.
Confirm the destination's size and format rules before compressing repeatedly.
Follow the method
- 1Preserve the original
Make a separate copy with a meaningful name and note the current size.
- 2Choose a reduction
Use a reputable PDF application's optimisation or compression option.
- 3Inspect the result
Compare page count, smallest text, important images and any form fields.
- 4Deliver the right copy
Check the final size against the recipient's limit and keep the original safely.
A checklist to keep
Use these checks to record what you found. The grid supports a decision; it does not make one for you.
| Check | What to examine | Action |
|---|---|---|
| Original | Is an untouched copy retained? | Keep |
| Size | What limit applies? | Check |
| Text | Is small print readable? | Zoom |
| Images | Are diagrams still useful? | Compare |
| Final | Do page count and fields remain? | Verify |
Free, no sign-up. UTF-8 text with semicolon-separated columns.
What to check
Compression can blur scanned text and diagrams.
Repeated compression can compound visible loss.
An online conversion service may be unsuitable for confidential documents.
Common questions
Why did size barely change?
The file may already use efficient compression or contain mostly text.
Can I just lower scan quality?
Only after checking the final file at the size the recipient needs to read.
Sources and documentation
Documentation consulted on . Examples are illustrative; interfaces and results may change.