Tinker Tools

Image Format Converter Instantly

Convert images between JPG, PNG, and WebP formats. All processing is done locally in your browser—your images never leave your device.

Preview

Drop your image here or click to browse

Supports JPG, PNG, WebP, GIF, BMP

How it works

1. Upload Image

Drag and drop or click to upload any image. We support JPG, PNG, WebP, GIF, and BMP formats. Your file stays in your browser.

100% Private

2. Choose Format

Select your desired output format (JPG, PNG, or WebP) and adjust the quality slider for lossy formats to balance file size and visual quality.

Quality Control

3. Download Result

Compare the original and converted images side by side with file size stats. Download the converted image with one click.

Size Comparison

Frequently Asked Questions

What is Image Format Conversion?

Image format conversion changes how pixel data is encoded and stored without altering what the image depicts. A photograph saved as a 4 MB PNG can become a 400 KB JPEG or a 300 KB WebP — same subject, same dimensions, drastically different file sizes. Each format uses a different compression algorithm, supports a different set of features, and makes different trade-offs between quality, size, and compatibility. Choosing the right format for each use case is one of the most impactful optimizations you can make for web performance, storage costs, and user experience.

The major raster formats break into two camps. Lossy formats — JPEG, lossy WebP, lossy AVIF — discard visual data that the human eye is unlikely to notice. They achieve dramatic compression ratios but cannot perfectly reconstruct the original pixel values. Lossless formats — PNG, lossless WebP, lossless AVIF, GIF — preserve every pixel exactly. They produce larger files but guarantee that what you save is bit-for-bit identical to what you opened. Some formats straddle both camps: WebP and AVIF each offer lossy and lossless modes in the same container, giving you flexibility without switching file extensions.

This tool converts between JPEG, PNG, WebP, AVIF, and GIF directly in your browser. You upload a file in any of these formats, pick a target format, adjust quality settings if the target is lossy, and download the result. The conversion uses the Canvas API and the browser's built-in image codecs — no server involved, no file uploaded anywhere. Your images remain on your machine throughout the entire process.

Key Features and Benefits

  • Five-format support — Convert between JPEG, PNG, WebP, AVIF, and GIF. That covers every mainstream web image format as of 2025. JPEG handles photographs. PNG handles transparency and pixel-perfect graphics. WebP offers the best balance of compression and features. AVIF pushes compression even further with AV1-based encoding. GIF remains the standard for simple frame-based animations.
  • Quality control for lossy formats — When converting to JPEG, WebP, or AVIF, a quality slider lets you set the compression level from 0 to 100. The tool shows a real-time preview and the estimated output file size so you can find the sweet spot. JPEG at quality 80 typically reduces size by 60-70% compared to PNG. WebP at quality 80 cuts an additional 25-35% beyond JPEG. AVIF at quality 60 can match the visual quality of JPEG at 80 in roughly half the file size.
  • Transparency handling — JPEG does not support transparency — it fills transparent areas with a solid color, defaulting to white. PNG, WebP, and AVIF all support full alpha channel transparency with 256 levels of opacity per pixel. GIF supports binary transparency — each pixel is either fully opaque or fully transparent, with no partial opacity. The tool warns you when converting from a format that supports transparency to one that does not, and lets you choose the fill color.
  • Animation preservation — Converting an animated GIF to animated WebP preserves all frames, frame delays, and loop settings. Animated WebP files are typically 20-30% smaller than equivalent GIFs at similar quality. AVIF also supports animation sequences — called AVIF Sequence — and produces even smaller files, though browser support is still catching up. Converting an animation to JPEG or static PNG extracts the first frame only, and the tool makes this explicit before you proceed.
  • Side-by-side comparison — A split-view panel shows the original format on the left and the converted output on the right. You can drag the divider to reveal more of either side and zoom into regions where compression artifacts are most visible — text edges, high-contrast boundaries, subtle gradients. This visual check prevents you from shipping an image that technically passes a file size budget but looks noticeably degraded.
  • Batch conversion — Drop an entire folder of images and convert them all to the same target format at the same quality level. This is the fastest way to migrate a legacy image library from JPEG and PNG to WebP. The output arrives as a zip archive with filenames matching the originals but using the new extension.

How to Convert Image Formats Online

  1. 1

    Upload your image

    Drag and drop a JPEG, PNG, WebP, AVIF, or GIF file onto the upload area. The tool reads the file locally and displays the current format, dimensions, and file size. For batch conversion, drop multiple files at once — they all appear in a queue with individual previews.

  2. 2

    Select the target format

    Choose the format you want to convert to from the dropdown menu. The tool disables the current format to prevent a no-op conversion. If you select JPEG and your source has transparency, a warning appears with options to set the fill color or switch to a transparency-supporting format like WebP or PNG.

  3. 3

    Adjust quality settings

    For lossy targets — JPEG, lossy WebP, or lossy AVIF — drag the quality slider to set the compression level. Start at 80 for photographs and 90 for images with text. For WebP and AVIF, you can also toggle between lossy and lossless modes. Lossless WebP produces files roughly 26% smaller than PNG according to Google's published benchmarks. Lossless AVIF compresses even further but encodes more slowly.

  4. 4

    Preview and compare

    The split-view comparison updates as you change the quality slider. Examine areas with fine detail — hair strands, thin lines, gradient transitions — at 100% zoom. If you see banding in gradients or ringing around sharp edges, raise the quality by 5-10 points. For AVIF, artifacts tend to appear as soft smearing rather than the blocky artifacts typical of JPEG, so look for loss of texture detail rather than block boundaries.

  5. 5

    Download the converted file

    Click download to save the converted image. The browser generates the file using its built-in codec and triggers a download with the new file extension. For batch jobs, the tool packages everything into a single zip archive. Original files are never modified — the tool creates a new file for each conversion.

Expert Tips for Choosing Image Formats

Use JPEG for photographs and continuous-tone images where transparency is not needed. JPEG's Discrete Cosine Transform — DCT — compression was designed for photographic content with smooth color transitions. At quality 80, JPEG typically achieves 10:1 to 15:1 compression ratios on photographs with minimal visible degradation. JPEG does not handle sharp edges well — text, line art, and screenshots with flat-color regions develop noticeable ringing artifacts around high-contrast boundaries. For those use cases, pick PNG or WebP lossless instead. JPEG is universally supported by every browser, email client, image viewer, and social media platform on every operating system — a compatibility advantage that still matters in 2025.

Use PNG when you need lossless compression or transparency. PNG uses the DEFLATE algorithm — the same one in ZIP files — applied to filtered scanlines. The filter step is what makes PNG efficient for graphics: it predicts each pixel based on its neighbors and encodes only the difference, which tends to be small in regions of solid color or smooth gradients. PNG supports 8-bit palette mode (256 colors, like GIF but better), 24-bit truecolor, and 32-bit truecolor with a full alpha channel. The alpha channel gives you 256 levels of transparency per pixel, enabling smooth anti-aliased edges against any background. PNG files are always lossless — there is no quality slider. If the file is too large, your only options are to reduce the dimensions or switch to a lossy format.

Use WebP as your default web format unless you have a specific reason not to. WebP supports lossy compression, lossless compression, transparency, and animation — all in one format. Lossy WebP uses a VP8-based encoder that consistently produces files 25-35% smaller than JPEG at equivalent SSIM scores. Lossless WebP beats PNG by roughly 26%. Browser support has reached 97% globally as of early 2025 — every major browser including Chrome, Firefox, Safari, Edge, and Opera handles WebP natively. The only remaining holdouts are very old browser versions and some specialized environments like certain email clients. For those cases, serve a JPEG or PNG fallback using the HTML picture element with a source tag for WebP and an img fallback.

Consider AVIF for maximum compression when you can tolerate slower encoding. AVIF is based on the AV1 video codec, developed by the Alliance for Open Media. It achieves roughly 50% better compression than JPEG and 20% better than WebP at equivalent perceptual quality, measured by the SSIM and Butteraugli metrics. AVIF supports HDR content, wide color gamuts (up to Rec. 2020), 10-bit and 12-bit color depth, and both lossy and lossless modes. The downside is encoding speed — an AVIF file can take 5-10x longer to produce than a JPEG, which matters for real-time conversion but is irrelevant for batch processing ahead of deployment. Browser support is strong in Chrome 85+, Firefox 93+, and Safari 16.4+. Use AVIF with a WebP or JPEG fallback in a picture element for the broadest audience reach with the smallest possible file sizes.

Related Tools

Image Compressor

Fine-tune compression after converting to squeeze out additional file size savings

Image Resizer

Resize dimensions before converting to avoid encoding unnecessary pixels

GIF Maker

Create animated GIFs from video clips or image sequences before converting to WebP or AVIF

Format conversion is the foundation of any image optimization pipeline. Choosing the right format for the right content — JPEG for photos, PNG for transparent graphics, WebP as a universal modern default, AVIF for maximum compression — can cut your total image payload by 50-70% without any change in visual quality. Pair conversion with resizing to eliminate wasted pixels and compression to fine-tune the quality-size balance. If you work with animations, convert legacy GIF files to animated WebP for immediate size savings with identical visual output. Every tool in this chain runs locally in your browser, keeping your files private and your workflow under your control from the first upload to the final download.

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