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I tried multiple PDF readers, and then I found Okular

It's especially useful if you need to convert somewhat niche formats, like DjVu or DVI files. Okular can even read certain ...
GitHub

JPEGView - Image Viewer and Editor

Popular: JPEG, GIF Lossless: BMP, PNG, TIFF, PSD Web: WEBP, JXL, HEIF/HEIC, AVIF Legacy: TGA, WDP, HDP, JXR Camera RAW formats: Adobe (DNG), Canon (CRW, CR2, CR3 ...