Compress Images to PDF
Need a smaller PDF for email or upload limits? LocalTools gives you real control: set the quality, maximum resolution, output format and even a target size in megabytes — for all images at once or for each image individually — and watch the estimated size update before you download.
- 🔒 100% private — no uploads
- 🆓 Free, no watermark
- 📱 Works on any device
How to convert
- 1
Add your images
Drag and drop your images onto the converter, or click to browse. You can select as many as you like — they’re loaded straight into your browser, never uploaded to a server.
- 2
Edit & configure (optional)
Open any image in the built-in editor to crop, rotate, adjust or annotate it. Set the compression quality, max resolution and output format for all images at once, or override any single image.
- 3
Reorder the pages
Drag the thumbnails to put the pages in the exact order you want. Each image becomes one page in the final PDF.
- 4
Download your PDF
Click “Download PDF”. The merged, compressed PDF is generated on your device and saved instantly — no email, no sign-up, no watermark.
Why use Compress Images?
100% private
All conversion happens locally in your browser using JavaScript. Your images are never uploaded, stored or seen by anyone.
Real compression control
Most converters give you a single “quality” toggle. Here you control quality, maximum resolution, output format and even a target file size — globally or per image — and see the estimated size before you export.
Built-in image editor
Crop, rotate, flip, adjust brightness/contrast, apply filters, add text or annotations and watermark — without leaving the page.
Works on any device
No install and no account. It runs in any modern browser on Windows, macOS, Linux, Android or iPhone.
How image compression shrinks your PDF
A PDF made from photos is essentially a container of images, so its size is driven almost entirely by those images. Two levers do the heavy lifting: lowering JPEG quality removes detail your eye barely notices, and reducing resolution cuts the pixel count (halving the longest edge roughly quarters the data). LocalTools applies both before assembling the PDF, and shows the estimated result per image so you can find the sweet spot.
Choosing the right quality and resolution
For email attachments, 70% quality at 1280–1600px usually produces a crisp, lightweight PDF. For documents that will be printed, keep 90%+ quality and 2048px or more. A target size in megabytes is the simplest option when you have a hard limit to hit — LocalTools compresses each image to meet it. And because every image can have its own override, one important page can stay high-quality while the rest are squeezed.
Frequently asked questions
How do I make the PDF smaller?
Lower the quality slider, reduce the maximum resolution (e.g. 1600px), choose JPEG output, or set a target size in megabytes. You can apply these to all images at once or override a single image. The estimated output size updates as you change settings.
How small can the PDF get?
Very small. Combine a lower quality (e.g. 60%), a reduced resolution (e.g. 1280px) and JPEG output to cut a multi-photo PDF down to a few hundred kilobytes. The per-image estimate shows the result before you export.
Are my images uploaded to a server?
No. Every step — decoding, editing, compression and PDF creation — runs entirely in your browser. Your files never leave your device, which is why it works even offline once the page has loaded.
Can different images use different compression?
Yes. Set a global default, then use the “Settings” button on any single image to override its quality, resolution or format independently.