Compress PDF to an exact KB size (not a guess)
Most free compressors ask for a quality percentage and hope the file shrinks enough. Portals ask for numbers: 50 KB, 200 KB, 400 KB. FilezyAI lets you set a minimum and maximum size in kilobytes and searches until the output lands inside that range.
PDF files from phones, scanners, and design tools are often ten to a hundred times larger than upload limits. This page is the generic PDF compressor; pick a preset KB page if you already know the portal cap.
How PDF compression works here
FilezyAI first runs structure-aware PDF compression (Ghostscript) to downsample embedded images and strip redundant objects.
If the file is still above your KB band, stronger passes reduce image DPI inside the PDF while keeping pages readable.
Scanned PDFs are mostly images wrapped in a PDF container, so they shrink like photos. Text-native PDFs often drop 40-85% on the first pass.
Real situations where KB targeting matters
- Indian railway and SSC exam photo uploads that reject anything above 50-100 KB
- Passport and visa e-forms where the preview box is smaller than a postage stamp
- University admission PDFs that must stay under 200-300 KB per document
- Job portals (Naukri, LinkedIn Easy Apply attachments) with strict mobile limits
- Government licensing and GST registration portals capping PDFs at 400-500 KB
- Email attachments that bounce back when Outlook sees 2 MB instead of 500 KB
Avoid these common errors
- Scanning at 600 DPI when the portal only needs 200 DPI readable text. Lower the scan resolution at the source when possible.
- Embedding full-resolution photos inside a Word export. Compress images before placing them in the document.
- Trying to hit 50 KB with a ten-page colour scan. Split pages or accept softer image quality at extreme targets.
Popular KB preset pages
Jump straight to the size your form mentions:
| Target | Typical use |
|---|---|
| 50 KB | Passport photo, digital signature, SSC/railway forms |
| 100 KB | Exam registration, KYC ID scan, scholarship upload |
| 200 KB | University forms, job portal documents |
| 400 KB | Government licensing, email PDF limit |
| 500 KB | Email comfort zone, CMS media library |
| 800 KB | Upper bound for many upload widgets |
Why FilezyAI runs multiple steps together
Most free converters handle one job per visit: format change, or a vague quality slider, or a crop tool on another tab. Portals rarely ask for just one of those — they publish a checklist (JPG, under 200 KB, 600×600 px, named photo.jpg). FilezyAI applies every toggle you enable in a single server job.
Uploads are removed automatically two hours later. No account is required on the free tier. Pro removes ads and raises file-size limits.
- Set min/max KB instead of guessing compression percentage
- Chain convert, compress, resize, rename, and metadata removal before one download
- Twelve input formats including HEIC, PDF, and Office documents
- AI mode when you prefer plain-English instructions over manual toggles
How to use this tool
- Upload your PDF file above.
- Open Compress and enter min/max KB values from your portal instructions.
- Add other toggles (convert, resize, rename) if needed.
- Click Apply changes once and download the result.