Source: https://restorebunny.com/guides/lossless-working-copy-cannot-recover-jpeg-detail/ # What a Lossless Working Copy Can and Cannot Preserve Use a lossless editing copy without mistaking a larger file for recovered image detail. File formats & delivery2 min readUpdated 16 October 2026 ## Try it on your own photo Repair a copy of your photo, then compare faces and details with the original. [Restore my photo]()1 credit per successful photo · Account required[See credit packs]() Quick answer ## The short version A lossless format can preserve a decoded working stage without adding another round of lossy compression. It cannot reverse detail already lost in an earlier JPEG, restore source focus or recover historical truth. Choose it to protect future work, not to certify the quality of the starting file. ## Define the job before editing A lossless format can preserve a decoded working stage without adding another round of lossy compression. It cannot reverse detail already lost in an earlier JPEG, restore source focus or recover historical truth. Choose it to protect future work, not to certify the quality of the starting file. ## Keep the capture history visible Record whether your source is an original scan, a camera file, a screenshot or a download. Make a lossless working copy when repeated edits require it, while retaining the actual source. Export a fresh sharing JPEG from the working stage rather than repeatedly editing the previous sharing export. ## Make the decision from evidence Compare visible detail at a sensible zoom and check dimensions. A dramatic increase in file size may simply reflect a different encoding. Do not describe the conversion as an enhancement unless you separately performed and documented an actual pixel-changing process. ## A worked planning example Example: A 900 × 600 JPEG becomes a much larger PNG but remains 900 × 600 pixels. The block artifacts are still visible. The PNG protects the next editing stage from additional JPEG loss; it does not recreate the missing texture. ## A practical checklist 1. Record the source type and dimensions. 2. Create a separate working copy. 3. Keep exports separate from editable stages. 4. Judge detail from the image, not file size. ## Keep a traceable result Keep the source file, the working copy and the delivery copy as separate items. Record the input and the changes you actually made so another person can understand the result later. These workflow examples are planning examples, not documented customer outcomes or proof of a successful restoration. ## FAQs Is a larger PNG necessarily a better source than a JPEG? No. Inspect provenance, dimensions and visible content. A PNG may simply be a decoded copy of a previously compressed JPEG. Should I replace my original with the edited copy? Keep the source unchanged and save a separate working or sharing copy. An export, edit or AI interpretation can omit information that remains useful in the source. ## Sources Preservation and technical guidance reviewed for this article. - MDN Web Docs: [Image file type and format guide]() ## Related - [Open the related free tool]() - [Base64 Images: File Size, Privacy and When to Use Them]() - [Why a Transparent Image Gets a White Background in JPEG]() - [Browse photo guides]() - [Free image tools]() ## Ready to restore your photos? Upload an image, choose your settings, and preview results with a before/after slider. [Restore my photo]()[View Pricing]() RestoreBunny Source-backed photo workflows Guides follow our [editorial policy]() for sourcing, product claims, AI limitations, updates, and corrections.