Free image converter — PNG, JPG, WEBP and more
Every FileShrink image converter runs entirely in your browser via the HTML5 Canvas API. Your files never touch a server. No signup, no watermark, no size limit beyond your device’s memory.
Picking the right image format matters more than most people realize. A 5 MB PNG hero image on a product page directly hurts your Largest Contentful Paint, drives up your CDN bill, and frustrates mobile visitors. Converting to WEBP or JPG with the right quality setting is often the fastest win available to a site owner — a single well-compressed image can shave a full second off a slow page load, which is the difference between a top-3 ranking and page two of Google results.
Below you will find every image conversion FileShrink currently offers. Each tool runs locally in your browser through the HTML5 Canvas API, so your files never leave your device. If you are not sure which format to pick, the short guide further down the page compares PNG, JPG, and WEBP with practical rules of thumb you can apply immediately.
All image converters
Which image format should you pick?
Every format has its strengths. Here are the four you will run into most often — the three that dominate the web, plus the one your phone is probably shooting with right now.
PNG
Lossless compression. Best for logos, icons, screenshots, UI mockups, and any graphic with sharp edges or transparency. Every pixel is preserved exactly. The trade-off is file size: PNG files are typically 3 to 10 times larger than JPG on photographic content because PNG’s compression is not tuned for continuous-tone images.
JPG
Lossy compression optimized for photographs. Universal compatibility: every image tool on the planet reads JPG. The trade-off is visible compression artifacts on text and sharp edges (ringing and blocking), and no support for transparency. It is still the safest format to hand to any tool or platform you are unsure about.
WEBP
Modern format with both lossy and lossless modes. Files are typically 25 to 70 percent smaller than PNG or JPG at equivalent perceived quality. Supports a full alpha channel for transparency. Works in every modern browser since 2020. The only caveat: a handful of legacy tools and very old operating systems still cannot read it.
HEIC
Apple’s default photo format since iOS 11, storing an HEVC-compressed image inside a HEIF container. Roughly half the size of an equivalent JPG with no visible quality difference, plus 10-bit colour and room for Live Photos and depth maps. The catch is licensing: HEVC carries patent royalties, so no browser except Safari can display a HEIC and Windows sells the codec as a paid extension. Excellent on your phone, unusable almost everywhere else — which is why converting is usually the first thing you do with one.
Quick decision guide
- Editing a photo multiple times?
- Convert to PNG first, then edit. PNG is lossless, so you will not accumulate generational loss from repeated re-saves like you would in JPG.
- Publishing a photo on the modern web?
- WEBP first, with a JPG fallback for any legacy destination that still rejects WEBP. WEBP typically ships 25 to 35 percent fewer bytes at the same visual quality.
- Uploading a logo to a design tool?
- PNG. It preserves transparency, has no compression artifacts on sharp edges, and is universally accepted by design software.
- Shrinking a screenshot as small as possible?
- WEBP at quality 80. Screenshots with flat colors and sharp text compress especially well in WEBP’s lossy mode.
- Sending an image to someone on old software?
- JPG. Its 30-year track record of universal compatibility means it will open on literally any device, OS, or email client.
- Photos straight off an iPhone?
- Convert HEIC to JPG when they need to open anywhere, or to WEBP when they are headed for a website. Only Safari can display a HEIC file directly — every other browser shows a broken image.
Why convert images in your browser?
Privacy by design
Nothing is uploaded. The HTML5 Canvas API reads your file locally, processes it locally, and produces the output locally. FileShrink has no server that handles your files.
Instant results
No upload round trip means no waiting on network latency. Most conversions finish in well under a second on modern devices, even for large images.
Works offline
Once the page has loaded, the tool keeps working even if you disconnect from the internet. There is no server dependency in the conversion path.
Free forever
Because there is no per-conversion server cost, there is no paywall, no usage limit, and no premium tier. Every tool is fully functional for everyone.
Frequently asked questions
- What is the difference between lossy and lossless image compression?
- Lossless compression preserves every pixel of the original image exactly — PNG and WEBP lossless work this way. Lossy compression, used by JPG and WEBP’s lossy mode, discards visual information in ways the human eye usually does not notice, producing dramatically smaller files in exchange. Lossy is the right pick for photographs intended for viewing; lossless is the right pick when you need to edit, archive, or preserve details perfectly.
- Does converting between formats always lose quality?
- It depends on the direction. Converting from a lossy format like JPG to a lossless one like PNG preserves the current pixels exactly but cannot undo the compression damage already baked in. Converting between two lossy formats compounds the loss slightly each time. Converting between two lossless formats is mathematically reversible — no quality is lost in either direction.
- Which image format is best for SEO and Core Web Vitals?
- WEBP is the clear winner on modern websites. At equivalent perceived quality, WEBP files are 25 to 35 percent smaller than JPG and 25 to 70 percent smaller than PNG. Smaller files mean faster Largest Contentful Paint, lower bandwidth bills, and better overall Core Web Vitals — all direct Google ranking factors in 2026.
- Can I preserve transparency when converting?
- Yes, as long as you pick a format that supports it on both ends. PNG and WEBP both carry a full alpha channel. If you convert a transparent PNG to WEBP, the transparency is preserved pixel for pixel. If you convert to JPG, the transparent pixels are replaced by a solid white background because JPG simply has no concept of transparency.
- Why does the same image have such different file sizes in different formats?
- Because each format uses a different compression algorithm tuned for different content. JPG targets the statistical properties of photographs and achieves excellent ratios on continuous-tone images. PNG targets flat colors and sharp edges and performs poorly on photos. WEBP uses a more recent algorithm that generally outperforms both. The same pixel data can produce files that vary by 10x or more depending on the format you pick.