# v2ray-config-modifier: bulk-generating V2Ray configurations in the browser > The V2Ray Config Modifier is a single page HTML and JavaScript application that takes one base VMESS, VLESS, WireGuard, or Trojan configuration and produces a batch of variants by substituting the address, with CIDR ranges, the published address lists of Cloudflare, Gcore, or Fastly, or a list of existing configurations to extract addresses from. It runs from a file:// URL with no server and no build step. **seramo/v2ray-config-modifier** — A web-based tool to generate V2Ray configurations for multiple IP addresses or ranges, supporting VMESS, VLESS, WireGuard, and Trojan protocols. - Repository: https://github.com/seramo/v2ray-config-modifier - Website: https://seramo.github.io/v2ray-config-modifier/ - Stars: 1,341 · Forks: 73 - Language: JavaScript - License: not declared - Published: 2026-10-19 · Updated: 2026-10-19 · Language: en - Canonical page: https://hysenlabs.com/projects/seramo-v2ray-config-modifier ## What the tool actually does The V2Ray Config Modifier is described as an HTML and JavaScript-based application designed to help users generate multiple V2Ray configurations efficiently. The mechanism is a template substitution with a twist: the input is an existing configuration, and the output is the same configuration repeated with the address replaced. Users can input existing VMESS, VLESS, WireGuard, or Trojan configurations, specify IP addresses or ranges, or choose from predefined IP ranges of popular CDN providers like Cloudflare, Gcore, and Fastly. The tool generates new configurations for each IP address or range. That framing matters for understanding the scope. This is not a configuration manager, a subscription server, or a client. It is a text transformation with a user interface, and the output is a set of configuration strings you paste into whatever client you already use. The feature list makes that clear with bulk config generation, export options to save to a file or copy to the clipboard, and a user-friendly interface with light and dark modes and no installation needed. There is one more transformation mode that is not a substitution at all. Standard WireGuard configurations in the usual INI form, with Interface and Peer sections, are converted into wireguard:// URLs, and several configurations can be converted at once. Existing wireguard:// URLs and Base64-encoded WireGuard URLs are also accepted as input. The project is written in JavaScript, the default branch is main, the home page is seramo.github.io/v2ray-config-modifier, and the last push to the repository was on 2026-10-02. There are no GitHub releases, and the licence is not declared. ## Running it, which is opening one file The prerequisites are modest. You need a modern web browser such as Chrome, Firefox, Edge, or Safari, an existing VMESS, VLESS, WireGuard, or Trojan configuration to use as a base, and a basic understanding of V2Ray configurations and IP addressing. Installation is a clone or a zip download, and then opening the file: ```bash git clone https://github.com/seramo/v2ray-config-modifier.git ``` Or download the ZIP file and extract it. Then you navigate to the extracted folder and open index.html in your browser. There is no build step, no package manager, and no server, because the top level of the repository is just index.html, a README, and an assets directory. The same application is also published at a public URL, and the README says the web-based version is fully functional and allows you to generate and download V2Ray configurations. That hosted version is a GitHub Pages deployment of the same static files. The distinction between the two matters for one specific reason. The local version opens from a file:// URL, which means the code runs on your machine and nothing about your configuration is sent anywhere. The hosted version runs the same code on someone else's server, so if you paste a configuration that contains credentials into the hosted page, you are pasting it into a page you do not control. For a tool whose input is a credential-bearing connection string, the local copy is the sensible default, and the fact that the whole thing is static is what makes that possible. ## The five input modes Step 2 of the usage guide offers five ways to specify where the generated configurations should point, and they differ in what the tool has to do. Option A is custom input. You provide a list of IP addresses, or one or more ranges in CIDR notation such as 192.168.1.0/24. Option B is the predefined ranges, where you select Cloudflare, Gcore, or Fastly, and the tool uses that provider's published address list. Option C is a config list, where you paste a list of existing VMESS, VLESS, WireGuard, or Trojan configurations, and the tool extracts the IP address from each one and uses those to generate new configurations based on the provided base config. That last mode is the one that is easiest to miss, and it is the most useful of the five, because the address list comes from configurations you already trust rather than from a range you typed. Option D is SNI Spoof, where you set a custom spoof IP and port, and the target IP and port are replaced with those custom values. Option E is Frag plus FP, where you enter one or more IP addresses for fragmentation and fingerprint configuration, with 104.21.70.21 and 188.114.97.6 as the default IPs. The note that you can combine custom IP ranges with predefined ranges for more flexibility is the point of the whole design. The tool is not choosing addresses for you, it is expanding a list you give it and stamping your base configuration across the results. ## The WireGuard conversion path, and the options it preserves The WireGuard mode is the one with its own workflow, and it is worth reading separately because it does not need an IP list at all. You paste one or more standard WireGuard configs containing Interface and Peer sections into the Configs field, select WireGuard as the input type, and click Generate to convert the configs directly to wireguard:// URLs. No IP list or IP range is required in this mode, and existing wireguard:// URLs and Base64-encoded WireGuard URLs are also accepted. The options that survive the conversion are the specific set that would break a connection if they were dropped. The supported options, such as Address, MTU, AllowedIPs, PresharedKey, PersistentKeepalive, and Reserved or ClientId, are preserved when available, along with AmneziaWG parameters. The Reserved field is the three-byte value used to bypass certain fingerprinting, and the AmneziaWG parameters are the extensions that obfuscate the WireGuard handshake itself, so a converter that dropped them would produce a URL that connects to the wrong endpoint or is trivially identifiable. That list is a good indicator of how the conversion was tested, incidentally. A tool that round-trips a configuration has to preserve every field that changes behaviour, and the set the documentation names is exactly the set of fields that do. ## Generating and exporting Step 3 is where the batch is produced. For IP ranges you set the number of outputs, and the default is 2048. You click the Generate button. In WireGuard mode the tool converts the provided WireGuard configs directly to wireguard:// URLs, and in the other modes it processes the base configuration and replaces the IP address with each IP from the specified ranges or config list. The generated configurations are then available for copying or downloading. Step 4 is the export, with a Copy button that copies all configurations to the clipboard and a Download button that saves all configurations to a file. The default of 2048 outputs is a signal about the intended use. A single configuration is not what anyone needs this tool for; the point is to have a set of configurations that all point at the same service but reach it through different addresses, which is the shape a CDN-fronted deployment takes when you want to distribute or to test path selection. 2048 Cloudflare addresses at 3 bits each is a set that would take a human an unreasonable time to produce by hand. One caveat about the output format is worth stating plainly. The tool substitutes the address into a base configuration. It does not verify that the address it substituted is one that serves your configuration, and it does not check anything about the target. That is the correct behaviour for a text tool and it is also the thing to keep in mind when you generate 2048 variants from a list, because a range that includes addresses your provider does not front will produce configurations that do not work, with no indication of which ones. ## Conclusion Adopt v2ray-config-modifier if you maintain many V2Ray or Xray configurations and need to regenerate them against a new address list, since the substitution logic is the whole tool and it runs offline. Do not adopt it if you need to manage, monitor, or distribute configurations, because it only generates text. Verify first that the address list you select actually resolves to the edge you intend, since the tool substitutes an address without checking what is behind it. ## FAQ ### What does the V2Ray Config Modifier do? It takes one base VMESS, VLESS, WireGuard, or Trojan configuration and generates a batch of variants by replacing the address, using custom IPs, CIDR ranges, the published address lists of Cloudflare, Gcore or Fastly, or addresses extracted from a list of existing configurations. It also converts standard WireGuard configs into wireguard:// URLs. ### Do I need to install anything to use the v2ray-config-modifier? You need a modern web browser and either a clone of the repository or the ZIP file. You open index.html from the extracted folder in your browser, with no build step and no server. The same application is also hosted online at seramo.github.io/v2ray-config-modifier. ### What options survive the WireGuard config conversion? The supported options such as Address, MTU, AllowedIPs, PresharedKey, PersistentKeepalive, and Reserved or ClientId are preserved when available, along with AmneziaWG parameters. Existing wireguard:// URLs and Base64-encoded WireGuard URLs are accepted as input as well. ### How many configurations does the tool generate by default? For IP ranges you set the number of outputs and the default is 2048. The generated set is then available to copy to the clipboard or download as a file. ### Does the v2ray-config-modifier check that the generated addresses work? No. It performs a text substitution on your base configuration, replacing the address with each address from the ranges or config list you supplied, and the output is available for copying or downloading. Any check that the address actually fronts your service is left to you. ## Sources - [Issues](https://github.com/seramo/v2ray-config-modifier/issues) - [Project website](https://seramo.github.io/v2ray-config-modifier/) - [README](https://github.com/seramo/v2ray-config-modifier/blob/main/README.md) - [seramo/v2ray-config-modifier on GitHub](https://github.com/seramo/v2ray-config-modifier) --- Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/seramo-v2ray-config-modifier