Does compression require uploading my PDF?

No. This runs in your browser using WebAssembly; the PDF file isn’t uploaded to an external server. Once the tool is loaded in the browser, you can actually compress PDF files even without an internet connection.

Will compressing make the PDF unsearchable?

No. PDF text is vector data (this includes lines, curves, and font data), and thus stays sharp and searchable regardless of how much compression is applied. Only embedded images are compressed. However, if you choose ‘aggressive’ mode, these layers are flattened and re-encoded as images, so text will no longer be searchable.

Why is my compressed PDF sometimes larger than the original?

This happens when the original file contains heavily compressed images or mostly text with few images. In such cases, there would be little to strip, and the added overhead of re-encoding would typically result in a larger output file than the original.

What does the compression level setting actually change?

Low cleans up the internal structure, or removes unnecessary data. Medium level strips metadata like author name and rebuilds the file into a more compact binary format. High resaves images at a lower quality, usually at 30% - you’ll see more pixelated photos using this preset.

Can I compress a password-protected PDF?

No. ConvertYard cannot read or write encrypted PDFs. You must first use the Unlock PDF tool to remove the PDF password before you can use this tool to compress it.

How does target-size mode differ from the compression level slider?

Target-size mode will run the compression up to six passes automatically. It first runs the structural cleanup pass, then slowly lowers image quality from 80 to 30%, only stopping when the target size is met. Use this option if you have a hard limit (for example, an email attachment or a government portal).

Is 500 KB enough for a high-quality scanned certificate?

Yes. A single A4 page scanned at 200 dpi color fits comfortably under 500 KB with minimal compression. At 300 dpi, you'll need light compression that still preserves all text and stamps clearly.

JoSAA asks for a 500 KB limit but also JPG format — can I use a PDF?

Some JoSAA upload slots accept only JPG. Check the upload field's accepted formats tooltip. For slots that accept PDF, 500 KB is the limit. For JPG-only slots, ConvertYard's image compressor can help you hit the size target in JPG format instead.

My 12-page bank statement is 4 MB. Can I compress it to 500 KB?

Probably not without text becoming illegible. Bank statements with small-font tables compress poorly below 100 KB per page. Consider uploading only the relevant pages (first page plus the transaction summary page), then compressing that shorter document.

Will compressing to 500 KB affect digital signatures or form fields in the PDF?

Compressing a digitally signed PDF typically invalidates the signature because the file bytes change. If your document has a valid digital signature that must be preserved, upload it as-is — do not compress.

Can I compress a password-protected PDF?

No. ConvertYard cannot read or write encrypted PDFs. You must first use the Unlock PDF tool to remove the PDF password before you can use this tool to compress it.

How does target-size mode differ from the compression level slider?

Target-size mode will run the compression up to six passes automatically. It first runs the structural cleanup pass, then slowly lowers image quality from 80 to 30%, only stopping when the target size is met. Use this option if you have a hard limit (for example, an email attachment or a government portal).

Compress PDF to 500 KB

Better quality than 100–200 KB while staying under the limit for DU, JoSAA, CUET, and job portals.

Drop files or a folder here

or click to browse · paste from clipboard

Accepts .PDF · Up to 1,000 files

How it works

Drop your files
Drag and drop, or click to browse PDF files. For larger files over 5 MB, do smaller batches of 5 to 10. For smaller files, you can do batches of up to 250.
Choose settings
This page is specifically for compressing PDFs to 500 KB. Other fixed size options include 100 KB, 200 KB, 300 KB, 1 MB, 5 MB, 20 MB, and 25 MB.
Click Compress
Everything runs in your browser via WebAssembly. Compression happens locally — no server involved.
Download
Download files individually or grab all at once as a ZIP.

500 KB is a comfortable target that gives noticeably better quality than 100–200 KB while still fitting nearly any portal upload form. It's the standard ceiling for college admission forms — DU's CSAS portal, JoSAA engineering counseling, and CUET applications — as well as many private job application portals and bank loan document submissions. The compression at this size is mild enough that photos and handwritten documents remain clearly legible.

When do you need 500 KB?

DU undergraduate admission (CSAS portal). Delhi University's CSAS portal caps uploaded mark sheets and certificates at 500 KB per document during admission registration.
JoSAA engineering counseling document uploads. JoSAA online counseling for IITs, NITs, and IIITs requires class-10 and class-12 certificates within 500 KB.
CUET application documents. NTA's CUET UG and PG application portals set a 500 KB per-file limit for uploaded identity and academic documents.
Private job application portals. Company career portals on Naukri, Indeed, and hiring platforms cap resume and certificate PDFs at 500 KB.
Bank loan application document package. Retail bank and NBFC loan portals require KYC, income, and property documents under 500 KB each to pass front-end validation.