Web Image Optimizer
Get an image ready to publish. TryImager checks the format, the pixel dimensions against the width you actually display, and the compression density, then optimizes locally — no upload, no signup.
Loading the optimizer…
Your image is prepared in your browser on your own device and is never uploaded to a server. The selection and the unsaved result are temporary page state, removed the moment you leave or reload.
How to prepare an image for its website placement slot
- Open the image you intend to publish. Use one supported raster image or SVG, not a PDF document or an HEIC phone original.
- Select a website layout slot preset (Hero/LCP banner, Article figure, Product card, or OpenGraph card) or enter a custom CSS container width.
- Check the Slot budget check card to see whether your image fits within the recommended kilobyte budget for that layout slot.
- Click Optimize Automatically to generate a WebP copy sized for that placement, then compare the visual preview and updated budget status.
- Copy the generated CLS-safe HTML <img> snippet (with explicit width, height, alt, and lazy/LCP loading attributes) and download the optimized WebP.
How to download the result
Use Download optimized image to save the generated WebP, and Copy HTML to copy the matching <img> tag with explicit width and height attributes. Download original saves the unchanged source. No file is published to your website automatically by this tool.
File handling and usage data
Website preparation runs on the selected image in this browser tab; the optimizer does not upload it or connect to your website. The selection and unsaved result are temporary in-page state, lost on refresh. Downloaded copies persist on your device. Analytics can log output scores, savings, input format and approximate megapixels, without sending the image or filename.
Full details are in the Privacy Policy.
Troubleshooting
Why is the proposed width wrong for my website?
Without a custom width, the tool uses the selected placement preset width. Measure your site's actual CSS slot width and enter it in Displayed width in px.
My publishing system rejects WebP. What should I do?
Keep the original if its format is accepted, or use a JPG/PNG converter. Automatic optimization here produces WebP; it does not guarantee compatibility with every content-management system.
Why did the page not become faster after replacing one image?
Fonts, scripts, other images and server response time also affect loading. Compare actual page measurements; a smaller image with explicit width/height attributes is one improvement, not a promise about the whole page.
Preparing images for a website
Publishing an image well is a short checklist: pick a modern format, ship it at about twice its display width, compress it lossily unless it needs to be pixel-exact, and keep transparency only where the design actually uses it. This page runs that checklist against a real file.
- Hero and banner images: usually the largest payload on a page — resize to layout width before compressing.
- Blog body images: rarely need more than 1200–1600 px of width.
- Product photos: benefit most from WebP, because they are numerous and often zoomable.
- Logos and icons: use SVG where you have it; otherwise WebP with transparency preserved.
Why oversized images cost more than bandwidth
A browser must download, decode and rasterise every image before it can paint. Decoding cost scales with pixel count, not file size, so a heavily compressed 24 megapixel photo can still stall a phone. Resizing addresses both halves of that problem at once, which is why automatic optimization resizes before it compresses.
Trimming excess megapixels and switching to modern formats cuts network transfer time and lowers main-thread memory pressure, though overall page speed still depends on your server, scripts, and layout.
Recommended pixel widths and byte budgets by slot
When you pick a placement preset or enter a displayed CSS width, the optimizer fits the output inside the preset's pixel bounding box and enforces its target KB ceiling:
- Hero / banner preset (1600×900 px bounding box, ≤ 180 KB budget): fits full-bleed hero images without shipping raw 4K camera dimensions.
- Blog / article image preset (1200×675 px bounding box, ≤ 110 KB budget): sized for 680–800 px content columns on high-density displays.
- Product / card thumbnail preset (600×600 px bounding box, ≤ 60 KB budget): keeps e-commerce grids and blog card lists fast.
- OpenGraph / social preview preset (1200×630 px bounding box, ≤ 150 KB budget): matches link-preview dimensions for fast crawler fetches.
Batch thinking with a single-file tool
Run two or three representative images through the optimizer — a hero, a body image and a logo — and note the format and width it settles on for each. Those three settings usually generalise across an entire site's export pipeline.
HTML embedding checklist after downloading
Once you download the `-optimized.webp` file, pair it with clean markup: include explicit `width` and `height` attributes matching the output dimensions, add descriptive `alt` text, use `fetchpriority="high"` (without `loading="lazy"`) on your single above-the-fold LCP image, and apply `loading="lazy"` `decoding="async"` to below-the-fold images.
For a photo that needs manual quality selection rather than automatic resizing, use JPG to WebP.
Frequently asked questions
What width should I publish images at?
Roughly twice the widest CSS width the image is displayed at, capped at the image's own size. That covers high-density screens without shipping pixels nobody sees. Enter your display width above and the optimizer applies exactly that rule.
Should every image on my site be WebP?
For photographs and most graphics, yes — every current browser can display WebP. Keep SVG for vector artwork such as logos and icons, since it scales without extra bytes.
Does this help Core Web Vitals?
Smaller, correctly sized images reduce how many bytes must arrive and decode before a page finishes painting, which is one of several inputs to loading metrics such as Largest Contentful Paint. It is one factor among many, not a guarantee.
How do I avoid Cumulative Layout Shift (CLS) when embedding the optimized file?
Read the final pixel width and height reported in the Before and after panel and set those exact numbers as the width and height attributes on your HTML <img> tag so the browser reserves the layout box before the image loads.
What happens if my image has a transparent background?
The optimizer samples the decoded alpha channel automatically. When transparency is present, it keeps the alpha channel intact inside the WebP output rather than flattening it onto a solid background.
When not to use this
For images used in email newsletters, check what the email service supports before choosing WebP output, since some mail apps cannot display it.
Product photos needing exact marketplace dimensions are better handled with Resize Image, where you set the pixels yourself.