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Compress PDF to 500KB

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3-step workflow · no sign-up

Compress a PDF in three steps

From a heavy PDF to a smaller one you can email or upload: no account, no watermark, and the file stays on your device.

  1. STEP 01

    Add your PDFs

    Drop up to 10 PDF files, up to 100 MB each. Locked or damaged files are flagged straight away.

    Read on this device
  2. STEP 02

    Pick a level or a size

    Choose one of four levels, or switch to Target size and pick a limit such as 200 KB.

    Your last level is remembered
  3. STEP 03

    Compress and save

    Check each result, rename it if you like, then save one file or all of them as a ZIP.

    Preview before you download
Guide

How to use this PDF compressor

The studio runs two passes on every file and keeps the smaller one, so a result is never bigger than what you put in.

Updated for 2026: compress by level or straight to a target size
  1. 1

    Know your limit

    If a form or portal names a maximum size, use Target size and type that number. Otherwise start with Recommended.

  2. 2

    Start gentle

    Pick the mildest level that gets under your limit. A harder level spends quality you may not need to lose.

  3. 3

    Preview the result

    Open the compressed file before you save it. Check that small print, stamps and signatures are still clear.

  4. 4

    Keep the original

    Compression is one way. Keep your original PDF and send the smaller copy.

Guide

How to get a small PDF that still reads well

Four habits that save more space than any setting.

Scans

Scan with care

Most of a scan's size is the picture of the paper. A clean, straight scan compresses far better than a shaky photo.

  • Flat page, good light
  • Crop to the paper
  • No phone shadows
Colour

Use greyscale for ink

Black ink on white paper doesn't need colour. Greyscale drops the colour from re-encoded pages.

  • Certificates and forms
  • Printed letters
  • Not for photos or stamps
Pages

Send only what's asked

If a portal wants one page, send one page. Fewer pages is the surest way to a smaller file.

  • Split out the page
  • Remove blank pages
  • Merge only what's needed
Text

Keep text PDFs lossless

A PDF made from Word or a website is mostly text. Lossless keeps it sharp and searchable.

  • Reports and resumes
  • Invoices from software
  • Anything you need to search
Guide

The four levels and target size, explained

Three levels turn each page into a JPEG image. Lossless never does. Target size searches for the best image quality that fits.

Extreme

Pages rendered at 1x and saved as JPEG at 50% quality. The smallest file, with visible softening.

Recommended

Rendered at 1.25x, JPEG at 70% quality. The balance most people want for scans.

Less

Rendered at 1.5x, JPEG at 85% quality. Sharper pages, a larger file.

Lossless

No pages re-encoded. Repacks the file and can clear metadata. Text, links and forms stay as they are.

Target size

Up to 30 tries at different quality and scale. Keeps the highest quality that fits your limit.

The safety net

Every level also runs the lossless pass. You get whichever is smaller, and never a file bigger than yours.

When a page is re-encoded, it becomes a picture of the page. Its text can no longer be selected or searched, and links stop working. If you need those, use Lossless.

Guide

How different people use the compressor

The same studio, set up differently for each job.

Exam and job applicants

Hard size limits

Application portals often cap each document. Read the limit in the portal's notice and type it into Target size.

Typical setting: Target size · greyscale for ink scans

HR and recruiters

Many files at once

Shrink a batch of resumes or offer letters in one go, then save them all as one ZIP.

Typical setting: batch of up to 10 · Recommended

Accountants and finance teams

Searchable records

Invoices and statements exported from software are text. Keep them searchable for later.

Typical setting: Lossless · strip metadata

Students and teachers

Course portals

Scanned assignments and notes get large fast. A middle level keeps handwriting readable.

Typical setting: Recommended · preview the result
How it works

Three promises the compressor keeps

What happens to your file, straight from how the tool is built.

Stays on your device

Two open-source libraries do the work on this page.

  • pdf-lib rewrites the file
  • pdf.js renders the pages
  • No PDF sent to a server
  • Works for confidential papers

Never bigger

Some PDFs are already as small as they get.

  • Two passes, the smaller wins
  • Bigger output? You get the original
  • Tiny savings marked 'already optimised'

Nothing added

The output is your document, smaller.

  • No watermark
  • No added pages
  • No sign-up wall

Password-protected PDFs can't be compressed. Unlock yours first with the PDF Password Remover, then come back.

Guide

Keeping your PDFs small over time

A few habits mean you rarely need to compress twice.

  1. 1

    Scan at sensible settings

    Very high scan resolutions make huge files. A normal document scan is usually enough for reading and printing.

  2. 2

    Keep a master copy

    Store the original and make a compressed copy for each upload. Compressing an already compressed copy loses more each time.

  3. 3

    Reuse your settings

    Recent compressions remember the level or target you used. Tap one to set it up again.

  4. 4

    Name files clearly

    Rename the result before you save it, so the right copy goes to the right form.

Compare

Which setting keeps what

What each setting does to your document, so you can pick before you press Compress.

What you getLosslessExtreme, Recommended, LessTarget size
Pages re-encoded as JPEG✓ NeverWhen smallerWhen over your limit
Selectable, searchable text✓ KeptLost if re-encodedLost if re-encoded
Links and form fields✓ KeptLost if re-encodedLost if re-encoded
Size saving on scansSmall✓ Large✓ As much as needed
Exact size limit✗ No✗ No✓ Yes, when reachable
Greyscale option✗ No effect✓ Yes✓ Yes
Bigger than the original✓ Never✓ Never✓ Never

"When smaller" means the tool compares the image version with the lossless one and keeps the smaller. A text-only PDF often stays lossless even on Extreme.

Pro tips

Pro tips for smaller PDFs

Small changes that make a big difference to the final size.

Leave a little room

This tool counts 1 KB as 1,024 bytes. Aim a little under a portal's limit to be safe.

Greyscale ink scans

Turn on greyscale in Advanced options for black and white documents.

Split long files

Compress only the pages you need. Cut them out first with Split PDF.

Zoom in on the preview

Check the smallest text and any signature before you save.

Lossless for originals

Use Lossless for documents you may need to search or edit later.

Damaged files

A PDF that won't open is flagged at upload. Re-export it from the app that made it.

Email limits

Personal Gmail accounts allow 25 MB of attachments. Compress, or send a ZIP of smaller files.

Photos, not PDFs?

For JPG or PNG files, use the Image Compressor instead.

Pro tip: if the target is still missed, change the input

When a file can't reach your size, the studio gives you the smallest version it managed and says so. More settings won't help much from there. Fewer pages, a greyscale scan or a cleaner scan will.

Which one

Pick a level, or set a target size?

A level is quick and predictable. A target size is slower but aims at an exact limit.

Everyday sharing · speed
1pass per file

By quality

One render at the level you pick, compared with the lossless pass. Best when there is no fixed limit, just "smaller, please".

Fastest · four fixed levels

Forms and portals · exact limit
30tries, at most

Target size

Searches quality and scale for the best result under your limit. Presets from 75 KB to 1 MB, or any number.

Slower on long files · each try renders every page

Email or chatRecommended level.
Form with a limitTarget size, set to the limit.
Text you'll searchLossless level.
Every timePreview before you save.
Verdict: if someone gave you a size limit, use Target size. If not, a level is faster and usually enough.
Use cases

What people compress PDFs for

The same studio, six everyday jobs.

Application uploads

Certificates, ID copies and photos for forms with a per-file limit.

Email attachments

Reports and statements that are too big to attach as they are.

Resumes

A resume that uploads first time on job sites with a size cap.

Invoices and bills

Smaller copies for clients and records, kept searchable with Lossless.

Assignments

Scanned homework and project files for course portals.

Private papers

Bank statements and medical reports, compressed without leaving your device.

Too many pages? Cut them down with Split PDF, or join several files with Merge PDF.

FAQ

Frequently asked questions

Quick answers about levels, target sizes, quality and privacy.

Can I compress a scanned PDF to 500KB?
Yes, scanned PDFs are essentially images so they compress well. A single-page scanned document typically reaches 100-300KB after compression. Multi-page scans may need higher compression.
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What people say

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Presets

More versions of Compress PDF

Other versions of this tool, each set up for a specific need.