Add Conversion History to Track Previous Conversions

[savniagrawal1701]

✨ Feature Request: Add Conversion History to Track Previous Conversions

Current Behavior

After converting a file (PDF to PNG, Image to WebP, Remove BG etc.),
the result is shown once and then lost forever. If the user refreshes
the page or navigates to another tool, there is no way to access or
re-download the previously converted file. There is also no history
of past conversions anywhere in the app.

Expected Behavior

A conversion history section should be available that:

• Shows a list of all recent conversions in the current session
• Displays file name, conversion type and timestamp for each entry
• Allows re-downloading the converted file directly from history
• Persists across page navigation within the same session
• Has a "Clear History" button to reset the list

Proposed Solution

• Store each conversion result in localStorage after successful
  conversion with file name, type, timestamp and download URL
• Add a "History" page or sidebar section that reads from
  localStorage and displays all past conversions
• Add a "Clear History" button to remove all stored entries
• History should be session-based and not send any data to server
  (keeping the app's privacy-first promise)

Why This Matters

• Users often convert multiple files and need to re-download
  a previous result without converting again
• Other file conversion tools like ilovepdf and smallpdf all
  have conversion history
• Keeps the app's privacy-first promise since everything
  stays in localStorage — no data sent to server

Files to Modify

• frontend/src/pages/ — add History.jsx page
• frontend/src/components/Sidebar/Sidebar.jsx — add History link
• frontend/src/App.jsx — add history route

Tech Involved

• React, localStorage, React Router

I am a GSSoC '26 contributor and would love to work on
this issue. Please assign it to me! 🙏

[Durgeshwar-AI]

@savniagrawal1701 Keep it 100% frontend implementation only also do not store it such that the conversion history should not last after the site closes.

[savniagrawal1701]

Hey @Durgeshwar-AI, I've completed the implementation of the session-based conversion history feature.
Just wanted to confirm one thing --- should the History link only be accessible from the sidebar
(inside tool pages), or would you also like a History button added to the landing page navbar
for easier access? Happy to add it either way, just wanted to check before submitting the PR. 🙂

[Durgeshwar-AI]

Hey @Durgeshwar-AI, I've completed the implementation of the session-based conversion history feature.
Just wanted to confirm one thing --- should the History link only be accessible from the sidebar
(inside tool pages), or would you also like a History button added to the landing page navbar
for easier access? Happy to add it either way, just wanted to check before submitting the PR. 🙂

Keep it only limited to sidebar and make it a distinguishable button. It will take me some time fir review as my exams are ongoing.