Initializing Secure Environment…
Initializing Secure Environment…
Reduce a PDF to 100KB or smaller — free, with no sign-up and no file upload. This size is what many online exam registrations, ID-verification systems and government portals demand for uploaded scans, photos and signatures. Heavy compression optimizes the embedded images aggressively while keeping any text perfectly sharp, because PDF text is vector data that is never degraded. Everything runs locally in your browser via Ghostscript compiled to WebAssembly.
To compress a PDF to 100KB, use Heavy compression and, for scans, lower the image resolution and convert to grayscale. On ihatepdf, upload your PDF, choose Heavy, and download a file at or under 100KB — free, with no sign-up, no watermark, and no upload to any server. Single-page documents reach 100KB most reliably.
Online exam registration systems, scholarship and government portals, and ID-verification forms often cap each uploaded file at 100KB to keep their databases small and uploads fast. A typical phone-scanned document is 1–5MB — far over the limit — so it gets rejected until compressed. Because that document usually contains an ID, signature or personal certificate, compressing it locally (instead of uploading to a third-party compressor) keeps your sensitive information private.
The bulk of a scanned PDF's size is image data, so target the images: convert color scans to grayscale (often a 50–70% reduction on its own), then apply Heavy compression. If you are still over, lower the scan resolution to 150 DPI or trim the white margins so the compressor is not wasting bytes on empty space. Multi-page scans are hardest to squeeze under 100KB total — if your portal accepts separate uploads, split the document and compress each page on its own.
Choose Heavy compression. If the file is a scan or photo, the biggest savings come from lowering image resolution and converting color scans to grayscale before compressing. A single-page scanned document almost always drops below 100KB; text-only PDFs are usually already under it.
It contains high-resolution images. Convert color scans to grayscale, lower the scan DPI to 150 or less, or remove unnecessary pages with the Organize Pages tool. For multi-page documents, split them with the Split PDF tool and upload pages separately if the portal allows.
Text stays sharp because it is stored as vectors, not pixels. Signatures and scanned content are images, so very aggressive compression can soften them slightly — keep them legible by trimming blank margins first so the compressor spends its budget on the content that matters.
Yes. Exam registration and government portals frequently require photos, signatures and documents under 100KB. This tool is built for exactly that, and because it runs locally your ID and personal documents are never uploaded to any server.
No. Compression runs entirely in your browser using Ghostscript via WebAssembly. Your document never leaves your device, and the tool works offline once the page has loaded.
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