What is the best free online image compressor?

ToolKit offers a free, privacy-first online image compressor that shrinks PNG, JPEG, and WebP files by up to 80%. All processing happens locally in your browser — your files never leave your device.

How do I convert WebP to PNG with transparency?

Open the WebP to PNG converter, drop your WebP file, and click download. Alpha (transparent) channels are fully preserved in the output PNG — no watermark, no signup.

Why is my PNG so large and how can I reduce it without losing quality?

Most PNG files can be shrunk by 60–80% by re-encoding them as WebP with high quality while keeping full transparency. ToolKit does this automatically and only returns a result when it is actually smaller than the original.

Is there an online photo editor that never uploads my images?

Yes. Every ToolKit tool — including the image compressor, WebP converter, and photo merge & brush editor — runs entirely in the browser. No uploads, no accounts, no tracking, 100% of the time.

How do I merge two photos and paint to reveal the bottom layer?

Use the Image Merge & Brush tool. Upload the top image (original) and the bottom image (effect), merge them, then brush over the canvas to erase the top layer and reveal the bottom layer. Supports undo/redo.

Free Online Image Tools — Compress, Convert & Edit Without Uploading

A privacy-first toolkit for everyday image tasks: compress PNG / JPEG / WebP files by up to 80% without visible quality loss, convert WebP to transparent PNG or JPG for universal compatibility, and merge & brush photos to create before/after reveals — everything runs in your browser. No uploads, no accounts, no tracking.

Free

WebP → PNG

Convert WebP images to transparent PNG. 100% local, no upload.

Free

WebP → JPG

Convert WebP to JPEG with white background. Instant, browser-based.

Free

Image Compressor

Compress PNG, JPEG, and WebP up to 80% smaller without visible quality loss. PNG → WebP auto conversion for massive size savings.

Free

Image Merge & Brush

Merge two photos and brush to reveal the bottom layer. With undo/redo — perfect for before/after comparisons and product retouching.

Soon

HEIC → JPG

Turn iPhone HEIC photos into universal JPEG files. No software needed.

Soon

SVG → PNG

Rasterize SVG vectors to PNG at any resolution. Client-side only.

What ToolKit helps you do

Shrink large images for websites, emails & apps

Large PNGs slowing down your site? Our image compressor re-encodes PNG as WebP — transparent, visually lossless, and up to 80% smaller. Perfect for blog images, WooCommerce / Shopify product photos, landing page heroes, and email attachments that need to stay under attachment limits.

Fix WebP compatibility ( Slack, WhatsApp, CMS, Outlook )

WebP is great — until a client, CMS, or messaging app rejects it. With our WebP to PNG converter you keep the transparent background, or use WebP to JPG when compatibility matters most. No watermark, no file size limit beyond your own browser.

Create before/after reveals & interactive brushes

Upload two photos — your "before" and "after" — then paint over the top layer to reveal the layer below. Great for skincare progress, home renovations, photo retouching comparisons, or product mockups. Full undo/redo, adjustable brush size and hardness.

True privacy — your files never leave your device

Every ToolKit tool uses the browser's Canvas API to process images locally. Nothing is uploaded, nothing is stored, and nothing is shared with third parties. If your internet drops, the tools still keep working.

Why ToolKit?

✓Files never leave your device — true privacy.
✓No signup, no email, no tracking, no watermark.
✓Works on any modern browser — desktop, tablet, mobile.
✓Open source. Free forever. Supported by minimal ads.