What is an Image Converter and how does it work?

An image converter is a tool that translates an image file from one format to another by decoding the source file, reading its raw pixel data, and re-encoding that data using a different format's compression and storage algorithm. For example, converting a PNG screenshot to JPG re-encodes the same pixel grid using JPEG's lossy DCT compression, producing a much smaller file at the cost of perfect pixel fidelity. Converting HEIC to JPEG re-encodes Apple's modern container format into the universally supported JPEG format for sharing on platforms that do not accept HEIC. PicsSizer's converter handles 30+ formats including JPG, PNG, WebP, AVIF, HEIC, GIF, TIFF, BMP, SVG, PSD, ICO, and JXL. All decoding and encoding runs locally in your browser using the Canvas API and WebAssembly — no files upload to any server. Output downloads start automatically once conversion finishes, with no temporary copy kept anywhere outside your browser.

Why should I convert my images to different formats?

Image-format conversion serves several practical purposes that depend on your destination and use case. Converting JPG photos to WebP or AVIF typically shrinks files by 25–50% at the same visual quality, which directly improves page-load speed and Core Web Vitals for websites. Converting iPhone HEIC photos to JPEG ensures compatibility with platforms, email clients, and older operating systems that do not support HEIC. Converting PNG to JPG drops large file sizes when transparency is not needed — for example, on photographs exported from screenshots. Converting raster PNG icons to SVG enables infinite scaling without quality loss. Converting TIFF or PSD master files to compressed web formats prepares them for online publishing. Format choice also affects color depth, transparency support, animation, and metadata preservation. Some destinations also require specific formats — for example, the iOS App Store accepts PNG and JPEG icons but rejects WebP and AVIF.

Which image formats can I convert between?

PicsSizer's image converter supports more than 30 formats as both input and output, covering nearly every common and specialty format used today. Input formats include JPG, JPEG, PNG, WebP, AVIF, HEIC, HEIF, GIF, TIFF, TIF, BMP, SVG, PSD (Photoshop), ICO, EPS, EXR, JXL (JPEG XL), and many more. Output formats include JPG, PNG, WebP, AVIF, GIF, TIFF, BMP, and ICO. Conversions between any supported pair are available — PNG to WebP, HEIC to JPG, PSD to PNG, TIFF to JPEG, AVIF to PNG, and so on. The tool also offers dedicated converter pages for the most common pairs, such as /heic-to-jpg, /png-to-webp, /webp-to-png, and /jpg-to-png. Each dedicated page includes preset settings optimized for that specific conversion direction. The converter also exposes per-format options such as JPEG quality, PNG bit depth, and WebP lossy-versus-lossless mode.

How do I convert images to WebP format?

Converting to WebP with PicsSizer takes four steps. First, upload your source image — JPG, PNG, HEIC, AVIF, GIF, BMP, or TIFF — by dragging it onto the upload zone or selecting from your device. Files up to 50 MB are supported. Second, choose WebP as the output format from the format dropdown. Third, decide between lossy and lossless WebP modes: lossy mode uses a quality slider similar to JPEG and typically produces files 25–35% smaller than equivalent-quality JPEGs; lossless mode preserves every pixel exactly while still shrinking PNG sources by 20–30%. Fourth, click Convert to process the file locally in your browser using a WebAssembly build of libwebp. WebP is supported in Chrome, Edge, Firefox, Safari 14+, and Opera, making it the preferred modern format for web images. The tool also handles batch conversion through the Bulk Image Converter.

Can I convert multiple images at once?

Yes. For batch conversion of many images at once, use the dedicated Bulk Image Converter, which accepts up to 100 files per session and packages all converted outputs into a single downloadable ZIP archive. Bulk mode applies the same target format and quality setting to every file in the batch, which is ideal for converting a full set of iPhone HEIC photos to JPG, a folder of PNG screenshots to WebP, or a Photoshop PSD export sequence to web-ready JPEG. Mixed-format input batches are supported — you can upload HEIC, PNG, and TIFF files in one batch and convert them all to WebP in a single pass. Individual files can be up to 50 MB each, with processing in parallel via Web Workers where supported, so 100 average-sized photos typically finish in under a minute on a modern laptop. As with single conversion, no files upload to a server.

Is my data secure when using the Image Converter?

Yes — every byte of your image stays on your own device. PicsSizer's converter processes files entirely using your browser's built-in JavaScript engine, Canvas API, and WebAssembly format-decoder libraries, which means images never leave your computer, never reach a server, never get stored in any database, and never become accessible to any third party — including PicsSizer. You can verify this yourself by opening your browser's Developer Tools, switching to the Network tab, and watching for outbound requests during conversion: you will see zero file uploads. This privacy model makes the converter appropriate for confidential client photographs, unreleased product images, identity documents, medical and legal materials, and any other files subject to data-handling policies such as GDPR, HIPAA, or internal NDAs. The tool also continues to work offline once the page has loaded. The same anonymous workflow applies whether you process one image or a hundred consecutive conversion sessions.

What's the best format for different use cases?

Choosing the right output format depends on your use case. For photographs on the web, WebP offers the best balance of file size and quality, beating JPEG by 25–35% at equivalent visual fidelity; fall back to JPEG when broad compatibility with older browsers and email clients is required. For graphics with transparency — logos, icons, screenshots, UI elements — use PNG for lossless quality or WebP-lossless for smaller files with the same transparency support. For next-generation web performance where every kilobyte matters, AVIF beats WebP by another 20–30% on photos and is now supported in Chrome, Firefox, Edge, Safari 16.4+, and Opera. For vector graphics that need to scale infinitely without quality loss, use SVG. For animations, use WebP or AVIF animation as a modern alternative to legacy GIF, with dramatically smaller files. For email attachments and chat sharing, JPEG remains the safest universal choice for compatibility across every recipient.

How do I maintain image quality when converting formats?

Maintaining quality during format conversion comes down to two choices: pick a lossless format when quality matters absolutely, and pick high-quality settings when using lossy formats. For zero quality loss, convert to PNG, WebP-lossless, AVIF-lossless, or TIFF — every pixel of the source is preserved exactly. For lossy formats like JPEG, WebP-lossy, and AVIF-lossy, set quality to 85 or higher for professional-grade output that is visually indistinguishable from the source under normal viewing conditions. Quality 80 is the typical web sweet spot for photographs, where files shrink dramatically with no perceptible loss. Avoid converting between two lossy formats in sequence — for example, JPEG to WebP and back to JPEG — because each lossy encode introduces a small additional quality drop. Whenever possible, convert directly from a lossless or original-quality master file. The tool also exposes per-format quality controls so you can fine-tune the trade-off for each conversion direction.

Image Converter

Convert Images Between Any Format — Free, Fast & Private

or drag and drop your image here

Supports JPG, JPEG, PNG, WEBP, SVG, GIF, HEIC, HEIF +22 more

Supports JPG, JPEG, PNG, WEBP, SVG, GIF, HEIC, HEIF, BMP, TIFF, HDR, JP2, RAF, PSD, CR3, DNG, APNG, AVIF, AVI, ESP, EXR, J2C, J2K, JXL, PFM, PNM, PPM, PSB, SGI, MPEG

Paste an image (Cmd/Ctrl+V)

30+ Formats SupportedPrivate Browser ProcessingQuality PreservationBatch ConversionInstant Results100% Free

100% Browser-BasedNo File UploadsBatch Processing

What Is an Image Converter?

An image converter is a tool that changes the file format of a digital image — for example, from PNG to JPG, HEIC to JPEG, or PNG to WebP — by decoding the source file and re-encoding the pixel data using a different format's algorithm. Each format has its own trade-offs: JPEG is small and universal but lossy, PNG is lossless and supports transparency but produces larger files, WebP and AVIF offer modern compression that beats JPEG by 25–50%, and HEIC is the default iPhone capture format that is not widely supported on the web. PicsSizer's image converter handles 30+ formats including JPG, PNG, WebP, AVIF, HEIC, GIF, TIFF, BMP, SVG, and PSD, with all processing running locally in your browser — no uploads required.

Convert Images for Any Purpose

Web Optimization

Convert images to WebP for faster page loading
Reduce file size without quality loss
Improve Core Web Vitals scores
Generate next-gen AVIF images

Platform Compatibility

Convert HEIC iPhone photos to JPEG
Prepare images for social media requirements
Create SVG from raster images
Ensure compatibility across all devices

Professional Workflow

Batch convert design assets
Prepare print-ready TIFF files
Process RAW camera files
Convert PSD layers for web delivery

How It Works

1
Upload Images
Drag & drop or click to select your images. Supports all major formats including HEIC, AVIF, and TIFF.
2
Choose Format
Select your desired output format from 30+ options including JPG, PNG, WebP, and PDF.
3
Download
Get your converted images instantly. No registration required, completely free.

Professional Image Format Conversion

Our advanced image converter tool allows you to easily transform images between different formats while maintaining quality. Perfect for professionals and casual users alike, our converter supports all major image formats including JPEG, PNG, WebP, and more. Whether you are a web developer optimizing images for different browsers, a designer preparing files for clients, or simply need to convert images for personal use, our tool provides a simple and effective solution.

Key Features of Our Image Converter

Lossless Conversion — maintain original quality when converting between formats. Batch Processing — convert multiple images simultaneously. Format Flexibility — support for all modern image formats including JPEG, PNG, WebP, GIF, SVG, HEIC, AVIF, TIFF, PSD, and more. Privacy Focused — all processing happens in your browser, your images never leave your device.

Supported Conversion Types

Web Formats: JPG, PNG, WebP, GIF, SVG, AVIF, APNG. Professional: TIFF, PSD, PSB, EPS, HDR, EXR. Mobile & Camera: HEIC, HEIF, CR3, DNG, RAF. Next-Gen: JPEG XL (JXL), AVIF. Start converting your images today — no registration required, completely free, and available on any device.

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Frequently Asked Questions About Image Conversion

Get answers to common questions about our free image format converter.

Still have questions? Contact our support team

Image Converter

What Is an Image Converter?

Convert Images for Any Purpose

Web Optimization

Platform Compatibility

Professional Workflow

How It Works

Upload Images

Choose Format

Download

Professional Image Format Conversion

Key Features of Our Image Converter

Supported Conversion Types

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Frequently Asked Questions About Image Conversion

1What is an Image Converter and how does it work?

What is an Image Converter and how does it work?

2Why should I convert my images to different formats?

Why should I convert my images to different formats?

3Which image formats can I convert between?

Which image formats can I convert between?

4How do I convert images to WebP format?

How do I convert images to WebP format?

5Can I convert multiple images at once?

Can I convert multiple images at once?

6Is my data secure when using the Image Converter?

Is my data secure when using the Image Converter?

7What's the best format for different use cases?

What's the best format for different use cases?

8How do I maintain image quality when converting formats?

How do I maintain image quality when converting formats?