A pure front-end audio/video to text conversion solution based on iFlytek API: enabling automatic segmentation and recognition of long audio files.

I recently discovered a very useful open-source project: a A purely front-end audio/video to text conversion toolThis tool requires no backend server; it can be downloaded locally and used as a static page, or deployed directly on static hosting platforms such as GitHub Pages and Cloudflare Pages.

When transcribing long audio files, the biggest pain point is often not the recognition rate, but... Duration limitMost online SaaS tools limit the transcription time for free users, and when directly calling speech recognition APIs (such as iFlytek's streaming interface), they usually cannot process very long recordings at once, making them more suitable for real-time recognition of short audio.

voice-to-text-tools The core logic is to move the "preprocessing" step to the browser: it first automatically segments long audio files into multiple short segments locally, then sends each segment for recognition according to API rules, and finally merges the results. This means that users do not need to manually edit the audio or set up a complex backend environment.

Technical Principle Analysis: FFmpeg WASM + iFlytek API

Ordinary text-to-web page conversion tools often only offer a simple UI wrapper, making them prone to errors when uploading large files due to triggering API time limits. This tool, however, introduces... FFmpeg WebAssembly (WASM)This is equivalent to running a lightweight audio and video processing software in the browser.

The specific execution process is as follows:

• Local slices:When you upload a 1-hour recording, the tool will use your computer's local computing power to automatically cut it into short segments of tens of seconds within the browser.
• Requests in batches:According to the limitations of the iFlytek interface, the slices are sent to the cloud for identification one by one.
• Results Reorganization:The front end receives and recognizes the text, then seamlessly splices it together, and supports exporting it to TXT or Word format.

Quick Start: How to Configure API Credentials

Since there is no backend, you need to provide your own API key to drive the tool. The specific steps are as follows:

1. Account preparation:Register and complete real-name authentication on the iFlytek Open Platform (xfyun.cn).
2. Obtain credentials:Create an application in the "Speech Dictation Service" in the console and record... APPID、API Key and API Secret。
3. Activation tool:Enter the above three data items in the tool's settings interface to start uploading and transcribing files.

Privacy Boundaries and Security Reminders

It is important to clarify that "pure front-end" does not mean "completely offline".

Data flow path:API credentials are only stored in the browser. localStorage The key is not uploaded to the author's server, effectively preventing key leakage. However, The identification process must be connected to the internet.The audio segments will be sent to iFlytek's cloud server for parsing.

Applicable Scenarios Analysis

Recommended use:

• Individual users occasionally need to transcribe long meeting, online course, or interview materials.
• Developers who want to reduce costs by configuring APIs, rather than paying expensive SaaS subscription fees.
• A geek needs to quickly deploy a transcription page for their own use.

Not recommended for use:

• Enterprise users with extremely strict requirements for data compliance, who are prohibited from having their data leave the domain.
• Team collaboration scenarios that require multi-device synchronization, account management, or historical record storage.
• For ordinary users who don't want to deal with configuration at all and prefer "out-of-the-box" operation (it is recommended to use Lark or CapCut directly).

Frequently Asked Questions

Q: What is the free quota for iFlytek API?
A: New applications typically have around 500 free calls per day, but please refer to the latest real-time policy on the iFlytek console for the specific quota.

Q: Can audio files be intercepted by third-party websites?
A: No. File slicing is done in the local browser, and the audio stream is sent directly to the iFlytek API without going through any intermediate servers.

Project entrance