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Lock PDF

Add a password to an unlocked PDF and download a protected copy in your browser.Free, fast, and secure

Add a password to any PDF with this free lock PDF tool. Choose a strong password, protect your file, and download the encrypted copy in seconds. Processing runs entirely in your browser with no uploads to third-party servers.

Password-protecting PDFs helps when sharing contracts, financial statements, medical records, or client deliverables. A locked PDF blocks casual opening before you email or store sensitive documents.

To remove protection from a file you own, use PDF Password Remover. For bulk image and video compression offline, download Compresso for Mac or Windows. PDF size issues: try Compress PDF first.

Try Other Free Tools

PDF to JPG Converter

Convert each page of a PDF document into high-quality JPGs.

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JPG to PDF Converter

Combine JPG, PNG, or WebP images into one PDF.

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Compress PDF

Shrink PDF file sizes for easier sharing and storage.

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Merge PDF

Combine multiple PDF files into one document.

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Split PDF

Extract specific pages or split a PDF into separate files.

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PDF to Markdown

Convert PDF text into editable Markdown.

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Markdown to PDF

Convert Markdown to a clean PDF document.

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Unlock PDF

Remove security and passwords from PDF documents.

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PDF Page Rotator

Fix misaligned pages by rotating them in your PDF.

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JPG to PNG Converter

Convert JPG images to PNG format with transparency support.

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PNG to JPG Converter

Convert PNG images to JPG format for smaller file sizes.

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WebP to PNG Converter

Convert modern WebP images to widely supported PNG format.

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PNG to WebP Converter

Optimize your PNGs by converting them to the WebP format.

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WebP to JPG Converter

Convert WebP images to standard JPG format easily.

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JPG to WebP Converter

Improve web performance by converting JPGs to WebP.

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SVG to PNG Converter

Rasterize vector SVG files into high-quality PNG images.

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Compress JPG Online

Reduce JPG file size free in your browser. No upload required.

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Compress PNG Online

Shrink PNG files free while keeping transparency. No upload.

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Compress WebP

Make your WebP images even smaller for faster loading.

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Compress SVG

Minify SVG code and reduce vector file sizes.

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Batch Image Resizer

Resize multiple images at once to custom dimensions.

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Compress to Target Size

Pick an exact size in KB or MB and compress an image or video to fit.

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Compress Video for Discord

Fit your clip under Discord's 20MB free upload limit.

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Compress Video for WhatsApp

Shrink videos so they send fast and keep their quality.

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Compress Video for Email

Get videos under the 25MB Gmail and Outlook attachment limit.

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Compress Image to 20KB

Compress a photo to 20KB for visa, passport, and government form uploads. Free, private, runs in your browser. No upload, no signup.

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Compress Image to 50KB

Compress a photo to 50KB for government, exam, and job application forms. Free, private, runs in your browser. No upload, no watermark.

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Compress Image to 100KB

Compress a photo to 100KB for job portals, college applications, and upload forms. Free, private, runs in your browser. No upload, no signup.

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Compress Image to 200KB

Compress a photo to 200KB for CMS uploads, school portals, and listing sites. Free, private, runs in your browser. No upload, no watermark.

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Compress Image to 500KB

Compress a photo to 500KB for resume portals, HR systems, and email-friendly sharing. Free, private, runs in your browser. No upload, no signup.

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Resize Image for Instagram

Resize photos to exact Instagram post, portrait, and Story dimensions.

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Crop Image

Crop images to common aspect ratios in your browser.

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Image Flip/Rotate

Mirror or rotate JPG, PNG, and WebP in your browser.

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Image Watermarker

Add text or logo watermarks in your browser.

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Image Metadata Remover

Strip EXIF, GPS, and other metadata for privacy.

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View All 36 Tools

Need to compress images or videos?

Download the app for Mac or Windows. Compress photos and videos offline. Personal is up to 200 files. Studio is unlimited.

Download for Mac

Free to download • 100% offline