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Free browser utilities can speed up routine coding and file tasks, but “privacy-first” is a design claim to verify—not a guarantee that every tool on a site handles data the same way. The ten utility types below cover common developer and freelance needs, from inspecting JSON to combining PDFs. Before entering sensitive information, check the specific tool’s processing method and disclosures.
10 useful browser utilities for everyday work
These are task categories, not a tested ranking or endorsement of particular services. Catalog listings establish that such tools are available; they do not establish that each implementation is secure, independently audited, or suitable for confidential data.
1. JSON formatter and validator
Format a compact API payload so its structure is easier to inspect, or validate JSON syntax while debugging. A formatter can help identify malformed commas, quotes, or brackets, but it does not confirm that the data is correct for an application’s schema. BrowserUtils and offlineutils list JSON formatting tools: BrowserUtils and offlineutils.
2. Base64 encoder and decoder
Encode or inspect Base64 text when debugging requests or data exchanges. Base64 is an encoding, not encryption: anyone who obtains the encoded value can generally decode it. Avoid treating it as a way to conceal credentials or private data. Both BrowserUtils and offlineutils catalog Base64 tools.
#1 Best Overall
- Compatible Model(s): Magicmoon brand filter only for 24 inch -diagonally measured - widescreen monitor - aspect ratio 16:9 - filter size: width: 20 15/16", Height: 11 13/16" (531mm x 298mm)
- Superior Privacy: The computer privacy filter makes the screen appear dark when looking at it from an angle (the angle is about 30 to 60 degree), but bright when looking directly at it. To change the privacy level - simply adjust your monitor’s brightness accordingly
- Eye and Screen Protection: Privacy Filter does not only protect your private life but also protects your eyes by blocking 30% of blue light , blocking the harmful blue light between 380 to 495 nm, it filters out the blue light and relieves eye strain
- Perfect For Open Workspaces: Great for maintaining screen privacy in open work spaces
- Includes Two Options: Option 1 uses clear adhesive strips that securely attach to any computer screen. Option 2 (for computer screens with a raised bezel only) uses slide mount tabs that easily stick to the display frame, allowing you to slide the privacy screen filter on and off as needed
3. URL encoder and decoder
Encode URL components or decode escaped values to inspect links and request parameters. Use a component encoder for a value being placed inside a URL; encoding an entire URL can change its separators and structure. BrowserUtils and WebUtil list URL encoding utilities: WebUtil.
4. Regular-expression tester
Try a pattern against representative sample strings and adjust it to see what matches. Test both expected matches and near-misses; a pattern that succeeds on one example may still be too broad or fail on real input. BrowserUtils and offlineutils list regex testers.
5. JWT decoder
Inspect a JSON Web Token’s encoded header and payload while debugging. Decoding only reveals encoded contents; it does not verify the signature, prove who issued the token, or establish that it is trustworthy. Never paste a live token or credential into an online decoder.
The Tool Desk
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- 【Privacy Filter Dimensions】- Width: 20 15/16" (532 mm), Height: 11 13/16" (299 mm), Diagonal: 24" (609.6 mm) - SightPro Blackout Privacy Screen Filter is engineered to be compatible with HP, Dell, Samsung, Lenovo, LG, Acer, ASUS, ViewSonic, and other monitor brands. Please verify your computer screen's width and height measurements before ordering. It's not recommended to make your selection based solely on your computer screen's diagonal size.
- 【Two Attachment Options】- Installs in minutes. Option 1 uses clear adhesive strips that securely attach to any computer screen. Option 2 (for computer screens with a raised bezel only) uses slide mount tabs that easily stick to the display frame, allowing you to slide the privacy screen filter on and off as needed.
- 【Superior Privacy and Anti Glare】- Our advanced multi-layered film filter blacks out your computer screen when viewing from the side, while maintaining a crystal clear screen straight-on. It also protects your eyes from harmful glare, UV, and blue light. [Note: It does not block visibility directly behind you, regardless of the distance.]
- 【Perfect for Travel and Open Workspaces】- Our computer screen privacy filter is the ideal solution for healthcare providers, mobile workers, commuters, students, and business travelers. Now you can stay compliant and safeguard sensitive corporate information while working in airplanes, subways, airports and public areas.
- 【Package Contents】- Each package includes one privacy screen shield filter, two sets of clear adhesive strips, two sets of slide mount tabs, and a microfiber cleaning cloth. Buy with confidence – located in the US, Sight Pro specializes in providing best-in-class privacy solutions to individuals, small businesses, corporations, government, and educational institutions. Our privacy screens are Section 889 and TAA compliant.
6. UUID generator
Generate universally unique identifiers for development workflows such as sample records, test fixtures, or client-side object IDs. Confirm that the generated identifier type and version meet your application’s requirements. BrowserUtils and offlineutils catalog UUID generators.
7. Hash generator
Generate a digest for a development task or checksum comparison. A general-purpose hash utility is not a password-storage system: password storage requires an appropriate password-hashing scheme and configuration, not simply a fast digest of the password.
8. Password generator
Create a candidate password only after verifying that the specific implementation generates it locally and does not transmit it. For important accounts, a reputable password manager’s built-in generator is usually a more practical workflow because it can create and store the password together.
Rank #3
![[2 Pack] 24 Inch Computer Privacy Screen Filter for 16:9 Widescreen Monitor](https://m.media-amazon.com/images/I/41SBKw3J4ML._SL160_.jpg)
- 【24 PRIVACY FILTER DIMENSIONS】 Width: 20 15/16" (20.9 inches/532 mm), Height: 11 13/16" (11.8 inches/299 mm) - 16:9 Aspect Ratio. Mamol computer privacy filters are designed to be perfectly compatible with HP, Samsung, Dell, Lenovo, Acer, Asus, LG, ViewSonic and other brands of monitors. Please check the width and height dimensions of your computer screen before ordering. If you have any questions about the dimensions, please contact us.
- 【ENHANCED PRIVACY PROTECTION】Mamol 24 inch computer privacy filter keeps your electronic information confidential, making it excellent for use in high traffic areas. the computer privacy screen 24 inch is designed with advanced microlouver technology to block visibility at around 30 degrees and black out screens completely near 60 degrees.
- 【EYES PROTECTION】 This blackout privacy screen greatly reduces eye strain and minimizes potential hazards to vision. It filters 99.9% of UV rays and suppresses 98% of blue light. As a reversible 24-inch privacy screen filter: The glossy side of the protector provides extra clarity and greater privacy, and the matte side minimizes glare and distracting reflections. Satisfy your different daily uses as needed.
- 【BETTER HD CLARTIY】Mamol 24 inch computer privacy screen Shield adds an extra layer of AR Ultra HD light transmission compared to others. It maintains the high definition of the screen without sacrificing too much screen brightness. It won't reduce the brightness and cause eye fatigue because of the privacy screen installed on the screen.
- 【ANTI SCRATCH & WASHABLE 】Our privacy anti-glare Monitor film has a surface enhancement layer to protect the privacy filter from scratches and fingerprints. It is washable and reusable. Even after prolonged use, you will get a brand new privacy screen for your desktop computer monitor after cleaning. Very Durable!
9. Image compressor
Reduce an image’s file size before delivery or sharing. Check the output dimensions and visual quality, since compression settings can affect both. Privatool lists an image compressor and says processing happens in the browser; that is the provider’s description, not an independent verification.
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10. PDF merger
Combine documents for a freelance handoff or administrative task. Check page order and the resulting file before sending it. Privatool lists PDF merging and describes its tools as browser-processed; verify the particular implementation before using client or confidential documents.
How to check whether a tool is genuinely privacy-conscious
A web app must send code to your browser, but that alone does not tell you whether the data you enter stays there. A client-side tool can process inputs on your device; a server-side tool uploads them for processing. Even when files are not sent to a provider, the site may still collect page-view or usage information.
Rank #4
- Privacy Screen Filter Size: If the visible area of your display has the following dimension: Width x Height (Exclude Frame/Arrow 1 to 3 mm errors): 20 15/16" x 11 13/16" (532 mm x 299 mm), then this filter is good for you. Very Important to double check your screen's Width and Height excluding frame before ordering. It's not recommended to make your selection based solely on your screen's diagonal size
- Left and Right Privacy: Not block visibility directly behind you, regardless of distance. The privacy filter makes the screen appear dark when looking at it from an angle (left and right 30 to 180 degree), but clear when looking directly at it. To change the privacy levels, simply adjust your monitor's brightness level accordingly
- Matte and Glossy Sides: It's a reversible privacy screen filter, giving you the flexibility to choose glossy or matte finish. The matte side will have less glare, however the glossy side will have stronger privacy
- Perfect for Open Workspaces: Ensure your working space is bright and well lit. Privacy screens do not work in dimly lit areas
- Two Installation Option: Option 1 uses clear double side adhesive strips that securely attach to any computer screen. Option 2 (for computer screens with a raised bezel only) uses slide mount tabs that easily stick to the display frame, allowing you to take out the privacy screen filter easily as needed
Read the disclosure for the specific utility
Look for an explanation of where processing occurs, what data is logged or retained, whether analytics or advertising are present, and whether an account is required. A site-wide statement may not cover every tool. BrowserUtils says 99% of its tools run in the browser and marks some as server-side, so its claim should not be generalized to every item in its catalog: BrowserUtils’ catalog.
Check the tool page and privacy policy
Confirm that the individual utility has a clear processing disclosure and that the privacy policy addresses relevant logs, analytics, advertising, retention, and third-party sharing. The JSON Formatter & Validator policy, for example, describes client-side JSON processing while also disclosing advertising and aggregate usage measurement: JSON Formatter & Validator privacy policy. Local processing does not necessarily mean a site collects no other information.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesTest network behavior with harmless input
If you are comfortable using browser developer tools, inspect the Network panel while using a non-sensitive sample. Look for requests made when you submit or process input, and note whether the behavior changes when a file is selected or a conversion begins. This is a practical spot check, not a complete security audit: a network trace cannot by itself establish how a service handles data elsewhere or prove that every code path is safe.
Best Value
- 【PRIVACY FILTER DIMENSIONS】- Width: 23 9/16" (598 mm), Height: 13 1/4" (337 mm), Diagonal: 27" (685.8 mm) - Peslv Dark 27 inch Privacy Screen Filter is engineered to be compatible with 27in Dell, HP, Samsung, Lenovo, LG, Acer, ASUS, Toshiba, ViewSonic, Aoc, Sceptre, PHILIPS, ViewSonic and other brands monitors with 16:9 aspect ratio. Please verify your computer screen's width and height measurements before ordering. It is not recommended to select a size based solely on the diagonal.
- 【HIGH-CLASS PRIVACY ABLE】Peslv collected suggestions from more than 2000 computer users and performed 22188 anti-peep angle corrections on the micro-blind optical technology to ensure that any line of sight beyond +-30° facing the screen will be shielded. With a Peslv computer privacy screen 27 inch, Protect the privacy of your computer monitor screen and no longer leak any confidential data.
- 【2 MOUNTING OPTIONS FOR EASY INSTALLATION】The Peslv 27 inch privacy screen for monitor supply 2 installation options, Various installation options, are Compatible with both 27" computer monitors with raised bezels and full-screen 27" computer monitors without raised bezels, and convenient installation allows you to complete the installation in 10 seconds. NOTE: Monitors without raised bezels are only available with mounting option 2.
- 【EXCLUSIVE DOUBLE-SIDED TECHNOLOGY】27-inch monitor privacy filter has a double-sided surface technology developed by Peslv. Matte or Glossy. With the matte surface facing outward, you can experience the advanced AG anti-glare technology from Germany while maintaining a 30-degree privacy angle, softening the strong light outdoors, and making the screen content clearly visible. With the glossy side facing outward, you can get a super anti-peeping effect with a privacy angle of 26 degrees.
- 【PROTECT SCREEN ALSO EYES】Filtering optical materials imported from Japan can reduce 92% of blue light and 98% of UV light, and filter all harmful light emitted from the screen to protect your eyes. The high-transparent and reinforced built-in protective layer not only presents high-definition picture quality but also protects your screen from scratches. Hurry up and place an order, own a privacy screen for a computer monitor 27 inch, and protect your monitor screen and your eyes.
Keep sensitive material out until you have evidence
- Do not paste production secrets, private keys, live access tokens, customer records, or confidential client files into an unverified utility.
- Use fabricated examples or sanitized copies when checking functionality.
- Prefer a trusted local application or an approved workplace tool when a task involves sensitive information.
What the catalog claims do—and do not—tell you
The providers describe broad catalogs, but those totals are self-reported and do not establish quality, privacy, or independent review of any particular utility.
| Provider | Provider-reported catalog claim | Privacy detail stated by provider |
|---|---|---|
| BrowserUtils | 299 tools (2026) | Its page says 99% run in the browser and acknowledges some server-side tools. Source. |
| offlineutils | 70+ developer and creator utilities (2026) | The provider claims its catalog runs in the browser. Source. |
| Privatool | 106 tools (2026) | The provider describes browser-side processing and separately discloses anonymous page-view analytics. Source. |
These descriptions are vendor-authored, not independent audits. Catalogs, policies, and tool behavior can change; check the current page before relying on a privacy claim.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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