Why compress a PDF?
Large PDFs cause four common problems: email providers reject them (Gmail blocks attachments over 25MB, Outlook caps at 20MB), job portals and government forms enforce strict upload limits (often 2–5MB), sharing links are slow to load on mobile, and they consume unnecessary cloud storage. Compression solves all four by removing redundant data and optimizing embedded images — without touching text quality.
How to compress a PDF free — step by step
- Go to ihatepdf.cv/compress-pdf — no account, no email, no software
- Click Select PDF to Compress or drag and drop your file
- Choose a compression level (see the guide below)
- Click Compress PDF Now and wait 5–30 seconds
- Download your smaller PDF — no watermark added
Your PDF never leaves your device. The compressor runs entirely in your browser using Ghostscript compiled to WebAssembly — which also means it works completely offline once the page has loaded.
Which compression level should you use?
- Light (20–30% reduction) — Images resampled to 300 DPI. Best for documents you will print professionally: portfolios, design work, high-resolution presentations. The output looks indistinguishable from the original.
- Medium (40–50% reduction) — Images at 150 DPI. The sweet spot for 99% of use cases: CVs, business reports, contracts, presentations shared via email. Barely any visible quality difference on screen.
- Heavy (60–70% reduction) — Images at 72 DPI. Maximum size reduction for archiving, internal records, or documents where file size is the priority over image sharpness. Text remains perfectly readable at all levels.
Will compression make my PDF blurry?
Text will never be affected — not even slightly. Text in PDFs is stored as mathematical vector paths, not pixels. Compression never touches it. What changes is raster images: photos, scanned pages, and illustrations embedded in the PDF are re-encoded at a lower resolution. At Light and Medium levels, this difference is invisible on a screen. At Heavy, photos may look slightly softer — but text stays razor-sharp.
How much can your PDF actually compress?
- Scanned documents — 50–70% reduction. Each scanned page is a large image. A 15MB scanned report typically becomes 2–4MB on Heavy compression.
- Presentations with photos — 40–60% reduction. Slide decks full of stock images compress significantly at Medium level.
- CVs and text-heavy reports — 10–30% reduction. Most savings come from font subsetting and metadata removal.
- Digitally created PDFs (from Word, Excel) — 15–40% depending on embedded fonts and graphics complexity.
Compress a PDF for email
Gmail blocks attachments over 25MB. Outlook caps at 20MB. Many HR systems and university portals have a 2–5MB upload limit. Here is the fastest approach:
- Try Medium compression first — most PDFs under 50MB compress well below 25MB
- If still too large, switch to Heavy compression
- If the PDF is still over the limit after Heavy compression, use the Split PDF tool to divide it into sections and send separately, then merge them back after submission if needed
Compress a PDF to under 1MB
A 1MB target is achievable for most PDFs using Heavy compression. If your file contains many full-page high-resolution images:
- Apply Heavy compression first
- If still over 1MB, split the PDF into smaller sections
- Compress each section individually
- Submit sections separately, or merge them back afterwards
Compress a PDF without uploading to a server
Most online PDF compressors — including ilovepdf, smallpdf, and Adobe Acrobat online — upload your file to their servers. For CVs, contracts, medical records, or anything confidential, this is unnecessary privacy exposure. ihatepdf uses Ghostscript compiled to WebAssembly: the entire compression pipeline runs inside your browser tab. Your file bytes never reach any server. The tool also works fully offline once the page is loaded.
Compress a PDF on Windows, Mac, iPhone, or Android
Because ihatepdf runs in the browser, it works on every device and operating system with no software installation. Open ihatepdf.cv/compress-pdf in any modern browser on any device. Mobile browsers are fully supported.
Compress a password-protected PDF
Password-protected PDFs cannot be compressed directly. You need to:
- Go to ihatepdf.cv/remove-password and decrypt the file
- Compress the unlocked PDF at ihatepdf.cv/compress-pdf
- If needed, re-encrypt using ihatepdf.cv/encrypt-pdf
Combine compress with flatten for maximum size reduction
PDFs with interactive form fields, annotations, and JavaScript carry significant overhead. Use Flatten PDF to convert all interactive elements to static content first, then compress. This two-step process often produces smaller files than compression alone, especially for PDFs that were originally fillable forms.
Frequently asked questions
Is there a file size limit for compression?
No artificial server limit. The practical limit is your device's available RAM — typically 100–150MB on desktop browsers. For very large PDFs, close other tabs before compressing.
Can I compress multiple PDFs at once?
The tool processes one PDF at a time. For batches, use the Merge PDF tool to combine them first, then compress the merged file in one pass.
Why is my compressed PDF still large?
If Heavy compression only reduces your file by 10–15%, the PDF likely consists mostly of text and vector graphics rather than images. Try splitting the document, or remove embedded images using the Redact tool.
Does compression affect forms, links, or annotations?
No. Hyperlinks, form fields, bookmarks, and annotations are all preserved. To lock content permanently after compressing, use the Flatten PDF tool afterwards.