Vecline

Measurable raster ⇄ SVG conversion — and a broad image + document toolkit. Ten raster formats, every one convertible to every other, with the accuracy of every conversion actually measured rather than asserted; plus PDF & Office (docx/xlsx/pptx) rendering and conversion, images → PDF, DXF at a real physical cut size alongside EPS and G-code for makers, centerline tracing and content-aware crop — most of it in a zero-dependency core that is CI-proven to bundle for a browser.

On flat artwork — logos, icons, UI, screenshots, pixel art — the output is bit-exact: SSIM 1.0000, PSNR ∞, zero differing pixels, and on a real logo smaller than imagetracerjs or vtracer manage while still only approximating — 24 KB against their 60 and 64. That comes from recognising the image is cheaper to encode exactly than to approximate, not from a better curve fit. Tracing now emits real curves by default — sub-pixel edge placement is on, which is the only thing that lets the curve fitter run at all; before this the default returned a staircase with zero curve commands on real artwork. It costs about 2.35x the gzipped bytes, because moving coordinates off the integer lattice costs compression, and --no-subpixel buys the old smaller output back. Pixel and exact modes are untouched and stay bit-exact. potrace is smaller than everyone and much less accurate, which is a real trade and not one this README will hide. On real photographs it leads all three on SSIM by 0.05–0.18 at their default settings; one documented vtracer flag closes part of that. It is not the fastest — imagetracerjs is quicker on every fixture measured. Every number in this README is reproducible: node scripts/fetch-corpus.mjs && npm run compare. (The corpus is fetched rather than committed — the photographs are not ours to redistribute.)

▶ Vecline Studio — vecline.xyz — the whole toolkit in your browser. Drop an image, a PDF, or a TGA/PNM/ICO no browser can read; tune it; watch live SSIM / PSNR / CIEDE2000; export SVG, DXF at a real cut size, EPS, PDF, G-code, React/Vue/Svelte/Solid components, colour separations, sprite sheets, favicons, BlurHash, or just re-encode between ten raster formats. Free, unlimited, no signup, works offline, and nothing is uploaded — every conversion runs in your tab, not on a server. (How it compares · dev playground)

vecline vectorize logo.png --verify

✓ logo.svg  400×300  pixel mode  4 shapes  2.1 KB → 7.5 KB  228 ms
  · Auto-selected pixel mode: 4 distinct colours, 1.0% run density. Output is bit-exact.

Accuracy  bit-exact (lossless)
  PSNR        ∞
  SSIM        1.000000 (luma 1.000000)
  RMSE        0.0000

The lossless guarantee

vecline vectorize anything.png --lossless

--lossless returns a bit-exact SVG or it fails. It never silently gives you a near-miss.

That is enforced by measurement, not by construction. Every candidate encoding is rendered back to pixels and compared against the source; anything that is not bit-identical is discarded, and if nothing survives, the command errors out. Candidates are tried in

... View full README on GitHub