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Convert JPG to PNG and PNG to JPG — plus WebP, AVIF, BMP, GIF, SVG and ICO as inputs — with full control over transparency, quality and PNG colour depth. Resize, sharpen, watermark, strip metadata, batch-rename and apply social or e-commerce presets, then download files individually, as Base64/CSS, or as a single ZIP. Everything runs locally with nothing uploaded.
Convert JPG/JPEG to PNG and PNG to JPG with a real Canvas pipeline — plus WebP, AVIF, BMP, GIF, SVG and ICO as inputs. Output stays pixel-accurate.
PNG keeps a full alpha channel. Converting to JPG? Choose a white, black, custom or auto-detected background and preview the result before you download.
A 1–100 JPG quality slider with presets, and PNG-8 / PNG-24 / PNG-32 modes with real median-cut colour reduction for the smallest possible PNG.
Every file is inspected for dimensions, colour count, transparency and compression type, then we recommend the best output format and quality for it.
One-click sizes for Instagram, YouTube, Pinterest, Amazon, Shopify, Etsy and more — correctly cropped and saved as the right format.
Resize, rotate, flip, sharpen, auto-enhance, denoise, grayscale, strip metadata and add a watermark in the same pass — no second tool needed.
Copy any converted image as Base64, a Data URI or a ready-to-paste CSS background rule, with responsive srcset suggestions.
Images are decoded, transformed and re-encoded entirely on your device. Nothing is uploaded, stored or logged — it even works offline once loaded.
Drag and drop JPG or PNG files (or a whole folder), paste from the clipboard, or click to browse. WebP, AVIF, BMP, GIF, SVG and ICO are accepted too.
Choose “To PNG”, “To JPG”, or leave it on Auto and let the analyzer pick the best target for each image based on transparency and content.
Set JPG quality or a PNG mode, choose a background for transparent areas, and optionally resize, sharpen or watermark — preview updates live.
Click Convert to process the batch in your browser, then download files individually, copy them as Base64/CSS, or grab everything as a ZIP.
JPG (also written JPEG) and PNG are the two most widely used raster image formats on the web, but they were designed to solve very different problems. JPG uses lossy DCT (discrete cosine transform) compression that throws away visual information the human eye barely notices, producing very small files that are ideal for photographs. PNG uses lossless DEFLATE compression that preserves every single pixel exactly, which makes it perfect for graphics, logos, screenshots and anything that needs transparency — at the cost of a larger file.
The single most important practical difference is transparency. PNG supports an alpha channel, meaning each pixel can be fully opaque, fully transparent, or anywhere in between. That is why a logo saved as PNG can sit on any background without an ugly rectangle around it. JPG has no concept of transparency at all — every pixel is solid — so when you convert a transparent PNG to JPG, those transparent areas have to be filled with a background colour. This converter lets you choose exactly which colour, or detect it automatically.
The second difference is how they handle detail. Because JPG is lossy, it struggles with hard edges, fine text and large flat areas of solid colour, where it introduces visible “mosquito noise” and blocky artefacts. PNG renders those perfectly. Conversely, PNG is inefficient at storing the smooth, complex tonal variation of a photograph, so a photo saved as PNG can be five to ten times larger than the equivalent JPG with no visible quality benefit. Choosing the right format for the right content is the core skill this tool helps you apply.
Choose JPG whenever the image is a photograph or a photo-like graphic with smooth gradients and no transparency. JPG’s lossy compression is extraordinarily good at shrinking these images — a full-resolution camera photo that is 8 MB as a PNG might be 1.2 MB as a high-quality JPG that looks identical on screen. That is why JPG is the default for digital cameras, social media uploads, e-commerce product photos, email attachments and image-heavy web pages where page-load speed matters.
Convert PNG → JPG when you have a screenshot of a photo, an exported design, or a product render that was saved as PNG and is now far too large to upload or email. Because the PNG has no transparency to lose, flattening it to a white (or brand-coloured) background and re-encoding as JPG at 85–92% quality typically cuts the file size by 70–90% with no perceptible loss. This converter shows you the exact before/after size and the percentage saved for every file.
A word of caution about generation loss: JPG is lossy, so each time you open a JPG and save it again, a little more detail is discarded. If you are converting an existing JPG to JPG (for example to resize it), keep the quality at 90 or above and avoid repeated round-trips. For master copies and files you will keep editing, work from a lossless original and only export to JPG at the final step.
Choose PNG whenever you need transparency, perfectly sharp edges, or a lossless master copy. Logos, app icons, UI elements, charts, diagrams, line art, screenshots of text and any graphic that will be layered over other content should be PNG. The lossless compression means the file you download is bit-for-bit identical to what you put in (after any edits you apply), with no compression artefacts around text or edges.
Convert JPG → PNG when you want a lossless working copy for further editing, when a platform or printer specifically requires PNG, or when you need to add transparency around a subject. It is important to understand what this conversion can and cannot do: turning a JPG into a PNG stops any further quality loss from that point on, but it cannot recover detail that JPG already discarded, and the resulting PNG will be considerably larger than the JPG because PNG stores photographic data inefficiently.
PNG also comes in three practical flavours that this tool exposes directly. PNG-32 stores 24-bit colour plus a full 8-bit alpha channel — the richest, most compatible option for transparency. PNG-24 is true colour with the transparency flattened away, ideal for sharp graphics on a solid background. PNG-8 reduces the image to a palette of 256 colours or fewer using real median-cut quantisation, which produces dramatically smaller files for flat graphics, icons and simple illustrations while keeping crisp edges.
Transparency is stored in PNG as an alpha channel: an extra value alongside red, green and blue that says how opaque each pixel is, from 0 (invisible) to 255 (solid). This is what lets a PNG logo float cleanly over a coloured header, or a product cut-out sit on any catalogue background. Our analyzer measures the exact percentage of non-opaque pixels in your file and reports it, so you know before you convert whether transparency is even in play.
JPG has no alpha channel, so transparency simply cannot survive a conversion to JPG. The transparent pixels must be replaced with something solid. This converter gives you full control over that “something”: choose a clean White background (the e-commerce standard), Black for dramatic or screen-style images, a Custom colour picked to match your page or document, or Auto, which samples the edges of your image and chooses a colour that blends in. A live, checkerboard-backed preview shows exactly how the flattened result will look before you commit.
If keeping transparency is essential, simply convert to (or stay on) PNG-32. The tool will warn you whenever a chosen output format would discard transparency, and it never silently flattens an image without telling you. That honesty matters: a surprising number of “converted” logos arrive at a print shop or marketplace with an unexpected white box because a tool flattened them without warning.
Compression is the art of making a file smaller. Lossy compression (JPG, WebP, AVIF) achieves huge savings by discarding information; lossless compression (PNG, GIF, BMP) preserves everything and saves less. The right amount of compression is a trade-off between file size and visual quality, and the sweet spot depends entirely on the content and where the image will be used.
For JPG, the quality slider (1–100) controls how aggressively detail is discarded. In practice, 90–100 is virtually indistinguishable from the original and suits print or hero images; 75–85 is the web sweet spot, cutting size substantially with no noticeable loss on screen; below 60 you start to see blocky artefacts in skies and around edges. This tool ships presets — Maximum, High, Balanced, Small and Web Optimized — so you do not have to guess, and it estimates the output size live as you drag the slider.
For PNG, the lever is the number of colours, not a quality value, because PNG is lossless. Reducing a flat graphic from millions of colours to a 256-colour PNG-8 palette can cut the file in half or more while looking identical, because palette images compress far better under PNG’s DEFLATE filter. Photographs, however, rely on thousands of subtle colour transitions, so palette reduction is the wrong tool for them — for a photo, JPG (or PNG-24) is the smaller, better choice.
Images are usually the largest assets on a web page, so optimising them is the fastest way to improve load time, Core Web Vitals (especially Largest Contentful Paint) and SEO rankings. The four levers, in order of impact, are: resize to the displayed dimensions, choose the right format, compress sensibly, and strip metadata. This converter applies all four in a single pass.
Resizing is the biggest win and the most commonly missed. Serving a 4000-pixel photo into an 800-pixel slot forces the browser to download and downscale roughly 25× more data than necessary. Set a sensible maximum width (1600–1920px for full-width heroes, less for thumbnails) before converting. Then pick the format by content: photos as JPG, graphics and anything transparent as PNG. For maximum modern performance, our sister Batch Image Converter also outputs WebP and AVIF.
Finally, re-encoding automatically removes EXIF, GPS and camera metadata, which shrinks files and protects privacy, and you can generate Base64 or CSS background snippets for tiny icons that you want to inline rather than request separately. For responsive layouts, the tool suggests a srcset of common widths so you can serve appropriately sized images to every device.
Online marketplaces have strict, specific image requirements, and getting them wrong means rejected listings or poor-looking products. The near-universal standard is a square image on a pure white background, saved as a high-quality JPG. Amazon, for example, wants the main image on a plain white background (RGB 255,255,255) with the product filling at least 85% of the frame, ideally 2000px or larger so zoom works.
This converter ships one-click presets for Amazon, Shopify, WooCommerce, Flipkart, Etsy, eBay and Walmart that set the correct square dimensions and target format automatically. Combine a preset with the White background option and a quality of 85–92, and a transparent product PNG becomes a marketplace-ready JPG in one step — correctly sized, correctly flattened, and small enough to upload quickly.
For your own storefront or product detail pages, consider keeping a transparent PNG master (so you can place products on lifestyle backgrounds) and exporting flattened JPGs for the catalogue grid where file size and consistency matter most. The batch queue lets you process an entire product shoot at once and download everything as a single ZIP.
Designers move between formats constantly: PNG for delivering logos and UI assets with transparency, JPG for mockups and photo-realistic comps, and lossless masters for archives. A reliable, honest converter that never silently degrades or flattens an image is a core part of that workflow, especially when handing assets to developers or clients who may not know the difference between the formats.
When exporting brand assets, deliver logos as PNG-32 so they drop cleanly onto any background, and provide a flattened JPG or PNG-24 version for contexts that cannot handle transparency (some legacy email clients and document templates). For app icons and favicons, PNG at exact sizes (such as 64×64 or 180×180) is expected — the Web presets handle these. For social campaign assets, the Social presets produce correctly cropped images at platform-perfect dimensions.
Because everything runs locally on the Canvas API, the tool is also a safe choice for confidential or unreleased design work: nothing is uploaded to a third-party server, there is no account, and the files leave memory the moment you close the tab. That combination of professional control and privacy is what sets it apart from upload-based converters.
Each social platform has preferred dimensions and a preferred format, and matching them prevents the platform from re-compressing or cropping your image in unflattering ways. As a rule, photographs and most posts should be JPG (every platform accepts it and it keeps uploads fast), while graphics with transparency that you will composite yourself should be PNG.
The built-in presets cover the common sizes: Instagram Post (1080×1080), Instagram Story and Reels (1080×1920), Facebook and LinkedIn link posts (1200×630), Pinterest Pins (1000×1500), YouTube thumbnails (1280×720) and banners (2560×1440), TikTok covers, WhatsApp status and Twitter/X posts. Selecting a preset sets the right dimensions and output format in one tap; you can still adjust quality, background and cropping afterwards.
A practical tip: upload at the platform’s exact recommended resolution rather than larger. Most platforms downscale oversized uploads with their own aggressive compression, which can look worse than if you had delivered the correct size at high quality yourself. This converter lets you hit the exact target every time.
Convert in batches to save time: drop in a whole folder, set your options once, and the queue processes every file with per-image progress, pause/resume/cancel and retry-failed controls. Download the lot as a ZIP with sequential filenames (image-001.jpg, image-002.jpg…) using the batch-rename options — ideal for product catalogues and content libraries.
Use the smart analyzer as a sanity check. It tells you the source format, exact dimensions, estimated unique colour count, transparency percentage and compression type, then recommends a target and quality. If you are unsure whether an image “should” be JPG or PNG, leave the direction on Auto and trust the per-image recommendation — it is based on objective signals, not guesswork.
Watch the analytics dashboard after a batch: it reports total space saved, average compression, success rate, processing time and how many files went to PNG versus JPG. Those numbers are a quick way to confirm you picked the right settings — a “conversion” that made your photos larger is a sign you sent them to PNG when JPG was the better choice.
| Format | Compression | Transparency | File size | Best for |
|---|---|---|---|---|
| JPG / JPEG | Lossy (DCT) | No | Small | Photographs, social media, e-commerce, email |
| PNG-32 | Lossless | Full alpha | Large | Logos, UI, cut-outs, anything with transparency |
| PNG-24 | Lossless | No (flattened) | Large | Sharp graphics & text on a solid background |
| PNG-8 | Lossless, ≤256 colours | Indexed alpha | Small | Flat icons, simple illustrations, small graphics |
HEIC and camera RAW cannot be decoded in the browser — convert them to JPG first, then use this tool. For WebP/AVIF output, try the Batch Image Converter.
Every JPG save recompresses the image. If you must export JPG again, stay at 90–100 to avoid visible “generation loss” around edges and text.
Logos, icons and screenshots with few colours shrink dramatically as PNG-8. Photos should use JPG or PNG-24 — palette reduction hurts gradients.
When flattening transparency for JPG, set the background to your site or document colour so the image blends in seamlessly instead of showing a white box.
A 4000px photo displayed at 800px wastes bandwidth. Resize to the size you actually display — it is the single biggest file-size win.
PNG is lossless, so a photographic PNG is often 5–10× larger than the same JPG. Use PNG only when you need transparency or perfectly sharp edges.
Re-encoding removes EXIF, GPS and camera data automatically — smaller files and better privacy. Keep originals if you need that metadata.
Every image is decoded, converted and re-encoded with the browser’s Canvas API on your own machine. There is no upload, no server processing and no storage — which means there is nothing to leak, nothing to delete, and no waiting on a network. It works offline once loaded, and your files are released from memory the moment you close the tab.
Yes, for photographs. PNG is lossless and stores photographic data inefficiently, so a photo PNG is often 5–10× larger than the JPG. If you need a small file and do not need transparency, convert to JPG (or PNG-24/PNG-8) instead.
JPG cannot store transparency, so transparent areas are filled with the background colour. Either keep the image as PNG-32, or choose a background colour that matches where you will place it. The live preview shows this before you download.
PNG-8 reduces the image to ≤256 colours, which can subtly shift smooth gradients. Increase the colour count, enable dithering, or switch to PNG-24/PNG-32 for photographic content. PNG-8 is best for flat graphics and icons.
WebP, AVIF, BMP, GIF, SVG and ICO are supported as inputs in modern browsers. HEIC and camera RAW cannot be decoded in the browser — convert them to JPG first (try the HEIC to JPG tool) and then use this converter.
Extremely high-resolution images (tens of megapixels) are memory-intensive in the browser. Enable resize to cap the longest edge (for example 4000px) before converting, or process fewer files at a time.