JPEG Quality Settings: What 85 vs 95 vs 100 Actually Means

Step-by-step

1. 1

   What the quality number actually controls

   JPEG quality (1–100) controls how aggressively the DCT coefficients are quantized. Higher quality = less quantization = more data kept = sharper image = larger file. Critically, it is NOT a linear scale. The difference between 95 and 100 is massive — file size roughly doubles. The difference between 75 and 85 is barely visible to the human eye. Treating the slider as linear is the single biggest mistake people make with it.

2. 2

   The practical quality tiers and when to use each

   Quality 100 is lossless‑like JPEG — use only for archival or when the file will be edited and re‑saved repeatedly; 3–5× larger than 85. 90–95 is high quality with minor artifacts visible only under magnification; use for professional portfolios, print preparation, product hero images. 80–85 is the sweet spot for web: visually identical to 95 in most cases at 40–60% smaller file size; use for blog images, social cards, thumbnails. 70–75 shows noticeable artifacts on sharp edges, text, and gradients; acceptable only for tiny thumbnails where size is critical. Below 70 produces visible compression blocks — avoid unless bandwidth is brutally limited.

3. 3

   Where artifacts appear and what they look like

   JPEG artifacts are most visible on sharp edges — text, logos, line art — and on gradients where banding shows up, high‑contrast boundaries like sky meeting a building, and large solid‑color areas where a posterization effect appears. Photos with lots of natural texture (grass, hair, bark, stone) hide artifacts well because the noise of the texture masks compression noise. Graphics, screenshots, and images with large flat areas expose artifacts quickly at lower quality.

4. 4

   Platform re‑compression: the hidden quality killer

   Twitter re‑compresses uploads to roughly 85; Instagram to 75–80 for feed images; Facebook to around 70 for non‑HD uploads. This means uploading at quality 100 doesn't help you — the platform will degrade it anyway. The trick: export at 85–90 yourself so you control the first compression pass. Uploading a clean 85 gives a better final result than uploading a 100 that the platform will re‑compress with aggressive settings.

5. 5

   Quality loss is cumulative — keep a master

   Every JPEG save re‑applies lossy compression. A quality‑80 save of an already quality‑80 JPEG is NOT the same as one quality‑80 save from the original — the second pass compounds artifacts from the first. Always keep an original PNG or a very high‑quality JPEG master and export fresh derivatives for each use. This is the discipline that separates images that age well from images that look progressively worse every quarter.

6. 6

   Test A/B with Omnvert Filters

   Use the Image Filters & Converters quality slider to export the same image at 80/85/90/95 and compare visually and by file size. Zoom to 200% on sharp edges (text, logos, eye details) to spot artifacts. In most cases you'll pick 85 and never look back.