Bcrypt

What is Bcrypt

Bcrypt is a way to turn a plain password into a special string that is harder to work with if someone gains access to stored data. Many people know they should hash passwords, but they do not want to set up code or run terminal commands every time they test a value. Have you ever wanted to check a bcrypt password hash without opening your whole project?

On FlexiTools.io, the Bcrypt page brings hashing and verification together on a single screen that runs in a browser. The Hash Password tab gives you a Password to Hash field, a Cost Factor slider, and a Generate Hash button that produces a bcrypt hash in a dedicated box. Within about 60 seconds, you can type a password, choose a cost value, generate a 60 character hash, and copy it for use elsewhere. The visible action is pressing Generate Hash, and the visible outcome is the new string that appears in the Bcrypt Hash area, alongside a small info row that confirms the algorithm version, cost, and length.

How to Use Our Bcrypt

1. At the top of the page, choose the Hash Password or Verify Password tab. When you click a tab, it becomes highlighted, and the matching panel below becomes visible while the other panel is hidden.

2. To create a new hash, stay on the Hash Password tab and enter your password into the field labeled Password to Hash. As you type, the characters are hidden by default, and you can tap the eye icon button to show or hide them. Adjust the Cost Factor (Rounds) slider, and you see the number next to the slider and the Cost value in the info row update to match.

3. Click the Generate Hash button below the cost controls. The placeholder text in the Bcrypt Hash box is replaced with an actual bcrypt hash string, and the info row under it continues to show Algorithm 2a, the chosen Cost, and the fixed Length of 60 chars. You can then press the copy button next to the hash field so the full string is ready to paste into your code or database.

4. To check a password against an existing hash, switch to the Verify Password tab. Enter the password in the Password field and paste the stored string into the Bcrypt Hash textarea, then click the Verify Password button. The result panel below, which first says Enter password and hash to verify, updates its icon area and text message to reflect the outcome of the check, and the status line at the bottom of the page can show brief feedback about what happened.

Why FlexiTools.io Offers the Best Bcrypt

Tabbed layout for hashing and verification

By splitting the page into Hash Password and Verify Password tabs, the tool keeps two related jobs together without mixing their controls. You move between making a new bcrypt hash and checking an existing one by clicking a clearly labeled tab instead of jumping between separate pages. Compared with using one off terminal commands, framework specific consoles, or generic hash generators, this layout lowers the chance of mixing up which value came from which step.

Explicit control over cost settings

The Cost Factor (Rounds) slider sits directly under the password input, with a live value display and a short hint that says Higher = more secure but slower, Recommended: 10-12. This makes the work factor visible every time you generate a hash, rather than hiding it in a configuration file or hard coded constant. Many people find it frustrating when a tool picks a cost value silently, leaving them unsure how strong or slow their hashes are.

Result handling built for real scenarios

The Bcrypt Hash output uses a multiline textarea, so you can see the whole 60 character string even on smaller screens, and a dedicated copy button sits right beside it. An info row summarises Algorithm, Cost, and Length, which is helpful when you paste the hash later and want to recall how it was produced. On the Verify Password tab, a result area with an icon and status text provides focused feedback, and a separate status line at the bottom gives another place for short notes instead of intrusive popups.

A Deeper Look at Bcrypt Password Hashing

At its core, bcrypt is a password hashing function. It takes a password and turns it into a fixed length string that is hard to reverse and expensive to guess through repeated trials. Instead of storing the original password, a system stores this derived string, often called a bcrypt hash, and later checks login attempts by running the same function and comparing results.

One important feature of bcrypt is that it includes a work factor, sometimes called the cost. The higher the cost, the more internal rounds the function runs, and the longer each hash takes to compute. On the Bcrypt page, that idea shows up as the Cost Factor (Rounds) slider and the Cost value in the info row under the output. Moving the slider from 4 up to 14 changes how heavy the hashing work is meant to be, which is why the hint warns that higher values are more secure but also slower.

Security references such as MDN Web Docs on password storage explain that a password hash should be intentionally slow. A fast hash lets an attacker test many guesses per second on stolen data. By choosing a cost that is comfortable on your own equipment but still noticeable, you make each guess more expensive without making your application feel stuck. The recommended range of 10 to 12 shown under the slider reflects a balance that is common in many real projects, though the right value always depends on hardware and risk.

Bcrypt also builds a salt into each hash. A salt is a random value combined with the password before hashing. Its role is to ensure that the same password does not always lead to the same hash and to break precomputed lookup tables. In the UI you do not see the salt as a separate field, but in common bcrypt formats the salt is stored together with the hash so that verification can reuse it. The Algorithm entry of 2a and the fixed Length of 60 chars in the info area match that style, where version, cost, salt, and derived key are packed into one text value.

Verification uses the same function in a different way. Instead of taking two plain strings and comparing them directly, a system takes the stored bcrypt hash, reads its cost and salt, runs the bcrypt algorithm on the candidate password, and checks whether the derived value matches what was stored. On the Verify Password tab, you act out this pattern by placing the password in the Password field and the stored bcrypt hash in the matching textarea, then watching the result area report back. The aria live behavior connected to that result panel is there so that each change in status is announced clearly for screen readers.

The W3C Web Cryptography API specification and MDN Web Docs both describe how modern applications use hashing and key derivation functions to protect secrets. Bcrypt fits into that picture as a way to handle human chosen passwords, which tend to be weaker and more predictable than random keys. Its cost factor gives you a knob that can be increased over time as hardware improves, which is why tools like the slider on this page are useful for testing how different settings feel in practice.

Consider a lived example. A small team is building an internal admin area for a service. Early in development, they pick Cost 8 for quick tests, but before launch they want something stronger without rewriting any code. One developer visits the Bcrypt page, types a sample password into Password to Hash, sets the slider to 10, and generates a hash. Seeing that the output still arrives fast enough for comfort in their browser, they decide that the production configuration should use 10 as the stored cost. Later, during debugging, another teammate uses the Verify Password tab with a real user hash from the database to confirm that a suspected login issue is caused by an input error rather than a hashing mismatch.

Pro Tips for Getting the Most Out of Bcrypt Hashing

Tip 1: Use the hashing and verification tabs together when testing changes. After you pick a cost value that feels right on the Hash Password tab, switch to Verify Password and confirm that the same password and hash pair behave as expected. This habit catches copy paste mistakes and helps you notice when a stored hash was generated with a different cost than the one you plan to use now.

Tip 2: Check cost values on hardware similar to your deployment setup. The slider lets you move from 4 to 14, but a value that feels fine on a desktop may feel heavy on a small server or phone. Run a few hashes at the higher settings on the devices that matter most, and aim for a short delay that is visible but not disruptive.

Tip 3: Keep hashes away from casual channels. When you copy from the Bcrypt Hash box, paste the value directly into the system that needs it instead of dropping it into chat or email. Treat the string as sensitive configuration data, even though it no longer contains the plain password.