StatusQueen's Compress PDF tool reduces the file size of your PDF documents online — for free, without watermarks, and without making you sign up. Choose how aggressive the compression should be, drop in up to 10 PDFs at once, and get a smaller file (or a ZIP archive of smaller files) back in seconds.
How to compress a PDF
- Drop one or more
.pdffiles into the upload area, or click choose files to browse from your device. Up to 10 files per batch, 100 MB each. - Pick a compression level: Extreme, Recommended, Low, or Lossless. The level controls how much image data the compressor is allowed to throw away.
- Optionally open Advanced settings to dial in a custom image DPI and JPEG quality, overriding the preset.
- Click Compress PDF. A single-file upload returns a single PDF; a multi-file batch returns a ZIP archive containing every compressed PDF.
- Hit Download when done. Files are removed from our server automatically after five minutes — or instantly when you click Delete file from server.
Choosing a compression level
- Extreme downsamples every embedded image to 72 DPI and recompresses it with low JPEG quality. Best for emailing PDFs, sharing on chat, or uploading to forms with tight size limits. Image-heavy PDFs typically drop 70–90% in size.
- Recommended downsamples to 150 DPI with moderate JPEG quality. Good balance between visible quality and file size — the right pick for most everyday PDFs (resumes, contracts, scanned docs). Typical savings: 40–60%.
- Low keeps images at 300 DPI with high JPEG quality. Use this when the PDF needs to print cleanly. Smaller savings (10–30%) but image quality stays close to the original.
- Lossless doesn't recompress images at all. It rewrites the PDF's internal stream encoding (the structural metadata between pages) using more efficient compression. Modest savings (5–20%) but every pixel of every image is bit-identical to the input.
What gets compressed
PDFs are containers that hold a mix of text, vector graphics, raster images, embedded fonts, and metadata. The four levels (other than Lossless) compress images by:
- Downsampling images that are at a higher DPI than the target — a 600 DPI scan gets reduced to 72/150/300 DPI.
- Re-encoding images as JPEG with the chosen quality factor.
- Subsetting fonts: only the glyphs actually used by the document are kept, not the entire typeface.
- Stripping unused metadata: thumbnails, JavaScript actions, embedded files, and unused page resources.
Advanced settings: when to use them
The Advanced settings panel exposes the two main dials behind the presets:
- Image DPI (50–300): the target resolution for downsampled images. 50 produces tiny files at the cost of obvious blockiness on photos; 300 is print-quality. The presets pick 72 (Extreme), 150 (Recommended) or 300 (Low).
- JPEG quality (40–95): the compression quality for re-encoded images. 40 is heavy artifacting; 95 is visually lossless. The presets pick around 50 / 80 / 90 respectively.
Override the presets only when you have a specific need — e.g. shrinking a presentation deck for email while keeping just enough resolution to read the slides on a phone. The advanced sliders are disabled when Lossless is selected, since lossless mode never touches the images.
Limitations
- Password-protected PDFs are rejected. Run them through our Unlock PDF tool first to remove the password, then compress here.
- Already-optimised PDFs may not shrink further — or, in rare cases, may grow slightly because of the recompression overhead. The Lossless mode is the safest pick when the source PDF is already small.
- Vector-only PDFs (text and shapes, no images) see the smallest gains. There's no images to downsample, so only stream compression and font subsetting can help.
- Heavily-edited or annotated PDFs sometimes see smaller-than-expected savings because annotations don't downsample.
Privacy and security
PDFs are uploaded over HTTPS, processed on our server and removed automatically after five minutes — or immediately when you click Delete file from server. We don't share, resell or analyse the contents of your documents, and the compression runs without ever signing you in. For details, see our Privacy Policy.
Frequently Asked Questions
How much can I shrink my PDF?
It depends on what is inside the PDF and which level you pick. Image-heavy PDFs typically drop 70–90% on the Extreme setting, 40–60% on Recommended, and 10–30% on Low. Text-only PDFs see smaller gains. The Lossless option recompresses internal streams without touching images and saves around 5–20%.
Will my PDF lose quality?
Only if you choose Extreme, Recommended or Low — these downsample images to a smaller resolution and recompress them as JPEGs. Lossless mode never recompresses images, so quality is bit-perfect. Pick Low or Lossless when you need to print the result.
Is the Compress PDF tool free?
Yes — completely free, no sign-up, no watermark and no daily limit. Up to 10 PDFs per batch and 100 MB per file.
Can I compress more than one PDF at a time?
Yes. Drop up to 10 PDFs in a single batch. The result downloads as a single PDF if you uploaded one file, or as a ZIP archive if you uploaded several.
What do the Advanced settings do?
Advanced settings let you override the preset with a custom image DPI (50–300) and a custom JPEG quality (40–95). Lower DPI and lower quality produce a smaller file. The presets pick sensible defaults for most cases — only use the sliders if you know exactly what trade-off you want.
Are my PDFs safe?
Yes. PDFs are uploaded over HTTPS, processed on our server and removed automatically after a few minutes — or instantly when you click Delete file from server. We do not keep, share or analyse your documents.
Will the compressed PDF still be searchable?
Yes. Text-based PDFs stay searchable and copy-pasteable after compression — only image data is recompressed. Scanned PDFs without OCR were not searchable to begin with; compression doesn't change that.